Index: imaps-frontend/node_modules/clean-css/History.md
===================================================================
--- imaps-frontend/node_modules/clean-css/History.md	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/History.md	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,1504 @@
+[5.3.3 / 2023-11-30](https://github.com/clean-css/clean-css/compare/v5.3.2...v5.3.3)
+==================
+
+* Fixed issue [#1262](https://github.com/clean-css/clean-css/issues/1262) - dynamically require os for edge runtime compatibility.
+
+[5.3.2 / 2023-01-19](https://github.com/clean-css/clean-css/compare/v5.3.1...v5.3.2)
+==================
+
+* Fixed issue [#1224](https://github.com/clean-css/clean-css/issues/1224) - incorrect parsing of selectors with double hyphen.
+* Fixed issue [#1228](https://github.com/clean-css/clean-css/issues/1228) - incorrect appending of '%' inside rgba colors.
+* Fixed issue [#1232](https://github.com/clean-css/clean-css/issues/1232) - support for `@container` keyword.
+* Fixed issue [#1239](https://github.com/clean-css/clean-css/issues/1239) - edge case in handling `@import` statements.
+* Fixed issue [#1242](https://github.com/clean-css/clean-css/issues/1242) - support for `@layer` keyword.
+
+[5.3.1 / 2022-07-13](https://github.com/clean-css/clean-css/compare/v5.3.0...v5.3.1)
+==================
+
+* Fixed issue [#1218](https://github.com/clean-css/clean-css/issues/1218) - double hyphen in at-rule breaks parsing.
+* Fixed issue [#1220](https://github.com/clean-css/clean-css/issues/1220) - adds optimization for nth-* rules.
+
+[5.3.0 / 2022-03-31](https://github.com/clean-css/clean-css/compare/v5.2.3...v5.3.0)
+==================
+
+* Adds customizable value optimizers for variables.
+* Fixed issue [#1159](https://github.com/clean-css/clean-css/issues/1159) - adds optimization for `nth-child` and `nth-of-type`.
+* Fixed issue [#1181](https://github.com/clean-css/clean-css/issues/1181) - CSS level 4 color functions with spaces.
+* Fixed issue [#1183](https://github.com/clean-css/clean-css/issues/1183) - fraction optimizer breaks `image-set`.
+* Fixed issue [#1208](https://github.com/clean-css/clean-css/issues/1208) - handling generic family names.
+* Fixed issue [#1210](https://github.com/clean-css/clean-css/issues/1210) - handling `file://` protocol.
+
+[5.2.4 / 2022-01-28](https://github.com/clean-css/clean-css/compare/v5.2.3...v5.2.4)
+==================
+
+* Fixed issue [#1196](https://github.com/clean-css/clean-css/issues/1196) - correctly parse variables & comments mix.
+
+[5.2.3 / 2022-01-26](https://github.com/clean-css/clean-css/compare/v5.2.2...v5.2.3)
+==================
+
+* Fixed issue [#1185](https://github.com/clean-css/clean-css/issues/1185) - keeping comments inside variables.
+* Fixed issue [#1194](https://github.com/clean-css/clean-css/issues/1194) - unexpected end of JSON input when source map is empty.
+
+[5.2.2 / 2021-10-21](https://github.com/clean-css/clean-css/compare/v5.2.1...v5.2.2)
+==================
+
+* Fixed an unsafe data URI regex, which, when clean-css is used as a service, could be used in a DOS attack.
+
+[5.2.1 / 2021-09-30](https://github.com/clean-css/clean-css/compare/v5.2.0...v5.2.1)
+==================
+
+* Fixed issue [#1186](https://github.com/clean-css/clean-css/issues/1186) - bad error handling in batch mode with promises.
+
+[5.2.0 / 2021-09-25](https://github.com/clean-css/clean-css/compare/5.1...v5.2.0)
+==================
+
+* Fixed issue [#1180](https://github.com/clean-css/clean-css/issues/1180) - properly handle empty variable values.
+
+[5.1.5 / 2021-08-05](https://github.com/clean-css/clean-css/compare/v5.1.4...v5.1.5)
+==================
+
+* Fixed issue [#1178](https://github.com/clean-css/clean-css/issues/1178) - fixes lack of space removal in variable blocks.
+
+[5.1.4 / 2021-07-29](https://github.com/clean-css/clean-css/compare/v5.1.3...v5.1.4)
+==================
+
+* Fixed issue [#1177](https://github.com/clean-css/clean-css/issues/1177) - fix to missing local imports when only remote ones allowed.
+
+[5.1.3 / 2021-06-25](https://github.com/clean-css/clean-css/compare/v5.1.2...v5.1.3)
+==================
+
+* Fixed issue [#1160](https://github.com/clean-css/clean-css/issues/1160) - keep zero units when inside multiple functions.
+* Fixed issue [#1161](https://github.com/clean-css/clean-css/issues/1161) - extra whitespace in URLs.
+* Fixed issue [#1166](https://github.com/clean-css/clean-css/issues/1166) - incorrect compoment splitting when empty multiplex part.
+
+[5.1.2 / 2021-03-19](https://github.com/clean-css/clean-css/compare/v5.1.1...v5.1.2)
+==================
+
+* Fixed issue [#996](https://github.com/clean-css/clean-css/issues/996) - space removed from pseudo classes.
+
+[5.1.1 / 2021-03-03](https://github.com/clean-css/clean-css/compare/v5.1.0...v5.1.1)
+==================
+
+* Fixed issue [#1156](https://github.com/clean-css/clean-css/issues/1156) - invalid hsl/hsla validation in level 2 optimizations.
+
+[5.1.0 / 2021-02-18](https://github.com/clean-css/clean-css/compare/5.0...v5.1.0)
+==================
+
+* Fixes stripping '%' from inside color functions.
+* Improves tokenization speed by ~30%.
+* Fixed issue [#1143](https://github.com/clean-css/clean-css/issues/1143) - some missing level 1 value optimizations.
+
+
+[5.0.1 / 2021-01-29](https://github.com/clean-css/clean-css/compare/v5.0.0...v5.0.1)
+==================
+
+* Fixed issue [#1139](https://github.com/clean-css/clean-css/issues/1139) - overriding & merging properties without `canOverride` set.
+
+[5.0.0 / 2021-01-29](https://github.com/clean-css/clean-css/compare/4.2...v5.0.0)
+==================
+
+* Adds a way process input files without bundling it into one big output file.
+* Adds level 1 and level 2 optimization plugins.
+* Disables URL rebasing by default.
+* Disables URL unquoting by default.
+* Drops support for Node.js 6 & 8 to support last 3 Node.js releases: 10, 12, and 14.
+* Fixed issue [#889](https://github.com/clean-css/clean-css/issues/889) - whitelisted level 1 optimizations.
+* Fixed issue [#975](https://github.com/clean-css/clean-css/issues/975) - incorrect block name optimization.
+* Fixed issue [#1009](https://github.com/clean-css/clean-css/issues/1009) - whitespace around comments.
+* Fixed issue [#1021](https://github.com/clean-css/clean-css/issues/1021) - allow one- and two-letter property names.
+* Fixed issue [#1022](https://github.com/clean-css/clean-css/issues/1022) - merging into shorthands new property positioning.
+* Fixed issue [#1032](https://github.com/clean-css/clean-css/issues/1032) - wrong order of merged shorthands with inherit.
+* Fixed issue [#1043](https://github.com/clean-css/clean-css/issues/1043) - `calc` fallback removed within other function.
+* Fixed issue [#1045](https://github.com/clean-css/clean-css/issues/1045) - non-standard protocol-less URL first slash removed.
+* Fixed issue [#1050](https://github.com/clean-css/clean-css/issues/1050) - correctly keeps default animation duration if delay is also set.
+* Fixed issue [#1053](https://github.com/clean-css/clean-css/issues/1053) - treats `calc()` as first class width value.
+* Fixed issue [#1055](https://github.com/clean-css/clean-css/issues/1055) - supports 4- and 8-character hex with alpha color notation.
+* Fixed issue [#1057](https://github.com/clean-css/clean-css/issues/1057) - level 2 optimizations and quoted font family name.
+* Fixed issue [#1059](https://github.com/clean-css/clean-css/issues/1059) - animation time units as CSS expressions.
+* Fixed issue [#1060](https://github.com/clean-css/clean-css/issues/1060) - variable removed when shorthand's only value.
+* Fixed issue [#1062](https://github.com/clean-css/clean-css/issues/1062) - wrong optimization of CSS pseudo-classes with selector list.
+* Fixed issue [#1073](https://github.com/clean-css/clean-css/issues/1073) - adds support for non-standard `rpx` units.
+* Fixed issue [#1075](https://github.com/clean-css/clean-css/issues/1075) - media merging and variables.
+* Fixed issue [#1087](https://github.com/clean-css/clean-css/issues/1087) - allow units with any case.
+* Fixed issue [#1088](https://github.com/clean-css/clean-css/issues/1088) - building source maps with source preserved via comments.
+* Fixed issue [#1090](https://github.com/clean-css/clean-css/issues/1090) - edge case in merging for `border` and `border-image`.
+* Fixed issue [#1103](https://github.com/clean-css/clean-css/issues/1103) - don't allow merging longhand into `unset` shorthand.
+* Fixed issue [#1115](https://github.com/clean-css/clean-css/issues/1115) - incorrect multiplex longhand into shorthand merging.
+* Fixed issue [#1117](https://github.com/clean-css/clean-css/issues/1117) - don't change zero values inside `min`, `max`, and `clamp` functions.
+* Fixed issue [#1122](https://github.com/clean-css/clean-css/issues/1122) - don't wrap data URI in single quotes.
+* Fixed issue [#1125](https://github.com/clean-css/clean-css/issues/1125) - quotes stripped from withing `@supports` clause.
+* Fixed issue [#1128](https://github.com/clean-css/clean-css/issues/1128) - take variables into account when reordering properties.
+* Fixed issue [#1132](https://github.com/clean-css/clean-css/issues/1132) - vendor-prefixed classes inside `:not()`.
+* Reworks all level 1 optimizations to conform to plugin style.
+
+[4.2.3 / 2020-01-28](https://github.com/clean-css/clean-css/compare/v4.2.2...v4.2.3)
+==================
+
+* Fixed issue [#1106](https://github.com/clean-css/clean-css/issues/1106) - regression in handling RGBA/HSLA colors.
+
+[4.2.2 / 2020-01-25](https://github.com/clean-css/clean-css/compare/v4.2.1...v4.2.2)
+==================
+
+* Fixed error when property block has no value.
+* Fixed issue [#1077](https://github.com/clean-css/clean-css/issues/1077) - local fonts with color in name.
+* Fixed issue [#1082](https://github.com/clean-css/clean-css/issues/1082) - correctly convert colors if alpha >= 1.
+* Fixed issue [#1085](https://github.com/clean-css/clean-css/issues/1085) - prevent unquoting of grid elements.
+
+[4.2.1 / 2018-08-07](https://github.com/clean-css/clean-css/compare/v4.2.0...v4.2.1)
+==================
+
+* Fixes giving `breakWith` option via a string.
+
+[4.2.0 / 2018-08-02](https://github.com/clean-css/clean-css/compare/4.1...v4.2.0)
+==================
+
+* Adds `process` method for compatibility with optimize-css-assets-webpack-plugin.
+* Fixed issue [#861](https://github.com/clean-css/clean-css/issues/861) - new `transition` property optimizer.
+* Fixed issue [#895](https://github.com/clean-css/clean-css/issues/895) - ignoring specific styles.
+* Fixed issue [#947](https://github.com/clean-css/clean-css/issues/947) - selector based filtering.
+* Fixed issue [#964](https://github.com/clean-css/clean-css/issues/964) - adds configurable line breaks.
+* Fixed issue [#986](https://github.com/clean-css/clean-css/issues/986) - level 2 optimizations and CSS 4 colors.
+* Fixed issue [#1000](https://github.com/clean-css/clean-css/issues/1000) - carriage return handling in tokenizer.
+* Fixed issue [#1038](https://github.com/clean-css/clean-css/issues/1038) - `font-variation-settings` quoting.
+* Fixes ReDOS vulnerabilities in validator code.
+
+[4.1.11 / 2018-03-06](https://github.com/clean-css/clean-css/compare/v4.1.10...v4.1.11)
+==================
+
+* Backports fixes to ReDOS vulnerabilities in validator code.
+
+[4.1.10 / 2018-03-05](https://github.com/clean-css/clean-css/compare/v4.1.9...v4.1.10)
+==================
+
+* Fixed issue [#988](https://github.com/clean-css/clean-css/issues/988) - edge case in dropping default animation-duration.
+* Fixed issue [#989](https://github.com/clean-css/clean-css/issues/989) - edge case in removing unused at rules.
+* Fixed issue [#1001](https://github.com/clean-css/clean-css/issues/1001) - corrupted tokenizer state.
+* Fixed issue [#1006](https://github.com/clean-css/clean-css/issues/1006) - edge case in handling invalid source maps.
+* Fixed issue [#1008](https://github.com/clean-css/clean-css/issues/1008) - edge case in breaking up `font` shorthand.
+
+[4.1.9 / 2017-09-19](https://github.com/clean-css/clean-css/compare/v4.1.8...v4.1.9)
+==================
+
+* Fixed issue [#971](https://github.com/clean-css/clean-css/issues/971) - edge case in removing unused at rules.
+
+[4.1.8 / 2017-09-02](https://github.com/clean-css/clean-css/compare/v4.1.7...v4.1.8)
+==================
+
+* Fixed issue [#959](https://github.com/clean-css/clean-css/issues/959) - regression in shortening long hex values.
+* Fixed issue [#960](https://github.com/clean-css/clean-css/issues/960) - better explanation of `efficiency` stat.
+* Fixed issue [#965](https://github.com/clean-css/clean-css/issues/965) - edge case in parsing comment endings.
+* Fixed issue [#966](https://github.com/clean-css/clean-css/issues/966) - remote `@import`s referenced from local ones.
+
+[4.1.7 / 2017-07-14](https://github.com/clean-css/clean-css/compare/v4.1.6...v4.1.7)
+==================
+
+* Fixed issue [#957](https://github.com/clean-css/clean-css/issues/957) - `0%` minification of `width` property.
+
+[4.1.6 / 2017-07-08](https://github.com/clean-css/clean-css/compare/v4.1.5...v4.1.6)
+==================
+
+* Fixed issue [#887](https://github.com/clean-css/clean-css/issues/887) - edge case in serializing comments.
+* Fixed issue [#953](https://github.com/clean-css/clean-css/issues/953) - beautify breaks attribute selectors.
+
+[4.1.5 / 2017-06-29](https://github.com/clean-css/clean-css/compare/v4.1.4...v4.1.5)
+==================
+
+* Fixed issue [#945](https://github.com/clean-css/clean-css/issues/945) - hex RGBA colors in IE filters.
+* Fixed issue [#952](https://github.com/clean-css/clean-css/issues/952) - parsing `@page` according to CSS3 spec.
+
+[4.1.4 / 2017-06-14](https://github.com/clean-css/clean-css/compare/v4.1.3...v4.1.4)
+==================
+
+* Fixed issue [#950](https://github.com/clean-css/clean-css/issues/950) - bug in removing unused `@font-face` rules.
+
+[4.1.3 / 2017-05-18](https://github.com/clean-css/clean-css/compare/v4.1.2...v4.1.3)
+==================
+
+* Fixed issue [#946](https://github.com/clean-css/clean-css/issues/946) - tokenizing `-ms-grid-columns` repeat syntax.
+
+[4.1.2 / 2017-05-10](https://github.com/clean-css/clean-css/compare/v4.1.1...v4.1.2)
+==================
+
+* Fixed issue [#939](https://github.com/clean-css/clean-css/issues/939) - semicolon after `@apply` at rule.
+* Fixed issue [#940](https://github.com/clean-css/clean-css/issues/940) - handling more `font` keywords.
+* Fixed issue [#941](https://github.com/clean-css/clean-css/issues/941) - breaking up vendor prefixed `animation`.
+
+[4.1.1 / 2017-05-08](https://github.com/clean-css/clean-css/compare/v4.1.0...v4.1.1)
+==================
+
+* Fixed issue [#938](https://github.com/clean-css/clean-css/issues/938) - removing unused at-rules with `!important`.
+
+[4.1.0 / 2017-05-07](https://github.com/clean-css/clean-css/compare/4.0...v4.1.0)
+==================
+
+* Improves longhand-into-shorthand merging mechanism in complex cases as with `border-*` shorthands.
+* Fixed issue [#254](https://github.com/clean-css/clean-css/issues/254) - adds `font` property optimizer.
+* Fixed issue [#525](https://github.com/clean-css/clean-css/issues/525) - restores `inherit`-based merging.
+* Fixed issue [#755](https://github.com/clean-css/clean-css/issues/755) - adds custom handling of remote requests.
+* Fixed issue [#860](https://github.com/clean-css/clean-css/issues/860) - adds `animation` property optimizer.
+* Fixed issue [#862](https://github.com/clean-css/clean-css/issues/862) - allows removing unused at rules.
+* Fixed issue [#886](https://github.com/clean-css/clean-css/issues/886) - better multi pseudo class / element merging.
+* Fixed issue [#890](https://github.com/clean-css/clean-css/issues/890) - adds toggle to disable empty tokens removal.
+* Fixed issue [#893](https://github.com/clean-css/clean-css/issues/893) - `inline: false` as alias to `inline: 'none'`.
+* Fixed issue [#905](https://github.com/clean-css/clean-css/issues/905) - allows disabling selector sorting.
+* Fixed issue [#906](https://github.com/clean-css/clean-css/issues/906) - improves usability of web UI settings.
+* Fixed issue [#908](https://github.com/clean-css/clean-css/issues/908) - improved `minify` method signature.
+* Fixed issue [#916](https://github.com/clean-css/clean-css/issues/916) - maximum number of merged selectors.
+* Fixed issue [#920](https://github.com/clean-css/clean-css/issues/920) - allows skipping certain properties in level 2 optimizations.
+* Fixed issue [#934](https://github.com/clean-css/clean-css/issues/934) - smarter longhand into shorthand merging.
+
+[4.0.13 / 2017-05-10](https://github.com/clean-css/clean-css/compare/v4.0.12...v4.0.13)
+==================
+
+* Backports [#939](https://github.com/clean-css/clean-css/issues/939) - semicolon after `@apply` at rule.
+
+[4.0.12 / 2017-04-12](https://github.com/clean-css/clean-css/compare/v4.0.11...v4.0.12)
+==================
+
+* Fixed issue [#930](https://github.com/clean-css/clean-css/issues/930) - regression in tidying selectors.
+
+[4.0.11 / 2017-04-04](https://github.com/clean-css/clean-css/compare/v4.0.10...v4.0.11)
+==================
+
+* Fixed issue [#924](https://github.com/clean-css/clean-css/issues/924) - `hsl` zero percent eager optimization.
+
+[4.0.10 / 2017-03-22](https://github.com/clean-css/clean-css/compare/v4.0.9...v4.0.10)
+==================
+
+* Fixed issue [#917](https://github.com/clean-css/clean-css/issues/917) - prevents grid area unquoting.
+* Backported [#916](https://github.com/clean-css/clean-css/issues/916) - maximum number of merged selectors.
+* Refixed issue [#556](https://github.com/clean-css/clean-css/issues/556) - IE backslash hacks.
+
+[4.0.9 / 2017-03-15](https://github.com/clean-css/clean-css/compare/v4.0.8...v4.0.9)
+==================
+
+* Fixed issue [#902](https://github.com/clean-css/clean-css/issues/902) - case insensitive attribute matchers.
+* Fixed issue [#903](https://github.com/clean-css/clean-css/issues/903) - web UI and source maps.
+* Fixed issue [#907](https://github.com/clean-css/clean-css/issues/907) - space after closing brace in `@supports`.
+* Fixed issue [#910](https://github.com/clean-css/clean-css/issues/910) - too aggressive precision optimizations.
+
+[4.0.8 / 2017-02-22](https://github.com/clean-css/clean-css/compare/v4.0.7...v4.0.8)
+==================
+
+* Fixes edge case in remote stylesheet fetching.
+* Fixed issue [#899](https://github.com/clean-css/clean-css/issues/899) - regression in optimizing pseudo class arguments.
+
+[4.0.7 / 2017-02-14](https://github.com/clean-css/clean-css/compare/v4.0.6...v4.0.7)
+==================
+
+* Fixed issue [#891](https://github.com/clean-css/clean-css/issues/891) - merging vendor-prefixed pseudo-classes.
+
+[4.0.6 / 2017-02-10](https://github.com/clean-css/clean-css/compare/v4.0.5...v4.0.6)
+==================
+
+* Fixed issue [#885](https://github.com/clean-css/clean-css/issues/885) - unquoting `font-feature-settings`.
+
+[4.0.5 / 2017-02-07](https://github.com/clean-css/clean-css/compare/v4.0.4...v4.0.5)
+==================
+
+* Fixed issue [#884](https://github.com/clean-css/clean-css/issues/884) - handling absolute paths on Windows.
+* Fixed issue [#881](https://github.com/clean-css/clean-css/issues/881) - incorrect `require` arity.
+* Fixed issue [#880](https://github.com/clean-css/clean-css/issues/880) - incorrect token type identification.
+
+[4.0.4 / 2017-02-04](https://github.com/clean-css/clean-css/compare/v4.0.3...v4.0.4)
+==================
+
+* Fixed issue [#879](https://github.com/clean-css/clean-css/issues/879) - incorrect handling of spaces in paths.
+* Fixed issue [#878](https://github.com/clean-css/clean-css/issues/878) - invalid double backslash tokenization.
+
+[4.0.3 / 2017-01-30](https://github.com/clean-css/clean-css/compare/v4.0.2...v4.0.3)
+==================
+
+* Fixed issue [#875](https://github.com/clean-css/clean-css/issues/875) - invalid traversing in semantic merging.
+
+[4.0.2 / 2017-01-26](https://github.com/clean-css/clean-css/compare/v4.0.1...v4.0.2)
+==================
+
+* Fixed issue [#874](https://github.com/clean-css/clean-css/issues/874) - regression in at-rule tokenization.
+
+[4.0.1 / 2017-01-25](https://github.com/clean-css/clean-css/compare/v4.0.0...v4.0.1)
+==================
+
+* Fixed issue [#866](https://github.com/clean-css/clean-css/issues/866) - edge case in `inline` option.
+* Fixed issue [#867](https://github.com/clean-css/clean-css/issues/867) - skip optimizing variable values.
+* Fixed issue [#868](https://github.com/clean-css/clean-css/issues/868) - accept absolute paths in input hash.
+* Fixed issue [#872](https://github.com/clean-css/clean-css/issues/872) - edge case in CSS tokenization.
+
+[4.0.0 / 2017-01-23](https://github.com/clean-css/clean-css/compare/v3.4.24...v4.0.0)
+==================
+
+* Adds more detailed error & warning messages on top of the new tokenizer.
+* Disables restructuring optimizations by default until optimized in #533.
+* Fixes a bug ignoring incorrect properties in complex restructuring.
+* Requires Node.js 4.0+ to run.
+* Removes `benchmark` API option as total time is always reported under `stats` property.
+* Removes `debug` API switch as stats are always gathered and available under `stats` property.
+* Replaces the old tokenizer with a new one which doesn't use any escaping.
+* Replaces the old `@import` inlining with one on top of the new tokenizer.
+* Re-enables `background-(clip|origin|size)` merging with `background` shorthand.
+* Simplifies URL rebasing with a single `rebaseTo` option in API or inferred from `--output` in CLI.
+* Splits `inliner` option into `inlineRequest` and `inlineTimeout`.
+* Fixed issue [#209](https://github.com/clean-css/clean-css/issues/209) - adds output formatting via `format` flag.
+* Fixed issue [#290](https://github.com/clean-css/clean-css/issues/290) - removes aggressive merging.
+* Fixed issue [#432](https://github.com/clean-css/clean-css/issues/432) - adds URLs normalization.
+* Fixed issue [#460](https://github.com/clean-css/clean-css/issues/460) - unescaped semicolon in selector.
+* Fixed issue [#657](https://github.com/clean-css/clean-css/issues/657) - adds property name validation.
+* Fixed issue [#685](https://github.com/clean-css/clean-css/issues/685) - adds lowercasing hex colors optimization.
+* Fixed issue [#686](https://github.com/clean-css/clean-css/issues/686) - adds rounding precision for all units.
+* Fixed issue [#703](https://github.com/clean-css/clean-css/issues/703) - changes default IE compatibility to 10+.
+* Fixed issue [#731](https://github.com/clean-css/clean-css/issues/731) - adds granular control over level 2 optimizations.
+* Fixed issue [#739](https://github.com/clean-css/clean-css/issues/739) - error when a closing brace is missing.
+* Fixed issue [#750](https://github.com/clean-css/clean-css/issues/750) - allows `width` overriding.
+* Fixed issue [#756](https://github.com/clean-css/clean-css/issues/756) - adds disabling font-weight optimizations.
+* Fixed issue [#758](https://github.com/clean-css/clean-css/issues/758) - ignores rules with empty selector.
+* Fixed issue [#767](https://github.com/clean-css/clean-css/issues/767) - disables remote `@import` inlining by default.
+* Fixed issue [#773](https://github.com/clean-css/clean-css/issues/773) - adds reordering based on selector specificity.
+* Fixed issue [#785](https://github.com/clean-css/clean-css/issues/785) - adds `@font-face` de-duplication.
+* Fixed issue [#791](https://github.com/clean-css/clean-css/issues/791) - resolves imports in-memory if possible.
+* Fixed issue [#796](https://github.com/clean-css/clean-css/issues/796) - semantic merging for `@media` blocks.
+* Fixed issue [#801](https://github.com/clean-css/clean-css/issues/801) - smarter `@import` inlining.
+* Fixed issue [#806](https://github.com/clean-css/clean-css/issues/806) - skip optimizing variable properties.
+* Fixed issue [#817](https://github.com/clean-css/clean-css/issues/817) - makes `off` disable rounding.
+* Fixed issue [#818](https://github.com/clean-css/clean-css/issues/818) - disables `px` rounding by default.
+* Fixed issue [#828](https://github.com/clean-css/clean-css/issues/828) - `-chrome-` hack support.
+* Fixed issue [#829](https://github.com/clean-css/clean-css/issues/829) - adds more strict selector merging rules.
+* Fixed issue [#834](https://github.com/clean-css/clean-css/issues/834) - adds extra line break in nested blocks.
+* Fixed issue [#836](https://github.com/clean-css/clean-css/issues/836) - enables level `0` optimizations.
+* Fixed issue [#839](https://github.com/clean-css/clean-css/issues/839) - allows URIs in import inlining rules.
+* Fixed issue [#840](https://github.com/clean-css/clean-css/issues/840) - allows input source map as map object.
+* Fixed issue [#843](https://github.com/clean-css/clean-css/issues/843) - regression in selector handling.
+* Fixed issue [#845](https://github.com/clean-css/clean-css/issues/845) - web compatibility of 4.0 branch.
+* Fixed issue [#847](https://github.com/clean-css/clean-css/issues/847) - regression in handling invalid selectors.
+* Fixed issue [#849](https://github.com/clean-css/clean-css/issues/849) - disables inlining protocol-less resources.
+* Fixed issue [#856](https://github.com/clean-css/clean-css/issues/856) - allows `minify` to return a promise.
+* Fixed issue [#857](https://github.com/clean-css/clean-css/issues/857) - normalizes CleanCSS API interface.
+* Fixed issue [#863](https://github.com/clean-css/clean-css/issues/863) - adds `transform` callback for custom optimizations.
+
+[3.4.26 / 2017-05-10](https://github.com/clean-css/clean-css/compare/v3.4.25...v3.4.26)
+==================
+
+* Backports [#939](https://github.com/clean-css/clean-css/issues/939) - semicolon after `@apply` at-rule.
+
+[3.4.25 / 2017-02-22](https://github.com/clean-css/clean-css/compare/v3.4.24...v3.4.25)
+==================
+
+* Fixed issue [#897](https://github.com/clean-css/clean-css/issues/897) - tokenization with escaped markers.
+
+[3.4.24 / 2017-01-20](https://github.com/clean-css/clean-css/compare/v3.4.23...v3.4.24)
+==================
+
+* Fixed issue [#859](https://github.com/clean-css/clean-css/issues/859) - avoid `-webkit-border-radius` optimizations.
+
+[3.4.23 / 2016-12-17](https://github.com/clean-css/clean-css/compare/v3.4.22...v3.4.23)
+==================
+
+* Fixed issue [#844](https://github.com/clean-css/clean-css/issues/844) - regression in property values extraction.
+
+[3.4.22 / 2016-12-12](https://github.com/clean-css/clean-css/compare/v3.4.21...v3.4.22)
+==================
+
+* Fixed issue [#841](https://github.com/clean-css/clean-css/issues/841) - disabled importing and files passed as array.
+* Ignores `@import` at-rules if appearing after any non-`@import` rules.
+
+[3.4.21 / 2016-11-16](https://github.com/clean-css/clean-css/compare/v3.4.20...v3.4.21)
+==================
+
+* Fixed issue [#821](https://github.com/clean-css/clean-css/issues/821) - reducing non-adjacent rules.
+* Fixed issue [#830](https://github.com/clean-css/clean-css/issues/830) - reordering border-* properties.
+* Fixed issue [#833](https://github.com/clean-css/clean-css/issues/833) - moving `@media` queries.
+
+[3.4.20 / 2016-09-26](https://github.com/clean-css/clean-css/compare/v3.4.19...v3.4.20)
+==================
+
+* Fixed issue [#814](https://github.com/clean-css/clean-css/issues/814) - `:selection` rule merging.
+
+[3.4.19 / 2016-07-25](https://github.com/clean-css/clean-css/compare/v3.4.18...v3.4.19)
+==================
+
+* Fixed issue [#795](https://github.com/clean-css/clean-css/issues/795) - `!important` and override compacting.
+
+[3.4.18 / 2016-06-15](https://github.com/clean-css/clean-css/compare/v3.4.17...v3.4.18)
+==================
+
+* Fixed issue [#787](https://github.com/clean-css/clean-css/issues/787) - regression in processing data URIs.
+
+[3.4.17 / 2016-06-04](https://github.com/clean-css/clean-css/compare/v3.4.16...v3.4.17)
+==================
+
+* Fixed issue [#783](https://github.com/clean-css/clean-css/issues/783) - regression in processing data URIs.
+
+[3.4.16 / 2016-06-02](https://github.com/clean-css/clean-css/compare/v3.4.15...v3.4.16)
+==================
+
+* Fixed issue [#781](https://github.com/clean-css/clean-css/issues/781) - regression in override compacting.
+* Fixed issue [#782](https://github.com/clean-css/clean-css/issues/782) - regression in processing data URIs.
+
+[3.4.15 / 2016-06-01](https://github.com/clean-css/clean-css/compare/v3.4.14...v3.4.15)
+==================
+
+* Fixed issue [#776](https://github.com/clean-css/clean-css/issues/776) - edge case in quoted data URIs.
+* Fixed issue [#779](https://github.com/clean-css/clean-css/issues/779) - merging `background-(position|size)`.
+* Fixed issue [#780](https://github.com/clean-css/clean-css/issues/780) - space after inlined variables.
+
+[3.4.14 / 2016-05-31](https://github.com/clean-css/clean-css/compare/v3.4.13...v3.4.14)
+==================
+
+* Fixed issue [#751](https://github.com/clean-css/clean-css/issues/751) - stringifying CSS variables.
+* Fixed issue [#763](https://github.com/clean-css/clean-css/issues/763) - data URI SVG and quoting.
+* Fixed issue [#765](https://github.com/clean-css/clean-css/issues/765) - two values of border-radius.
+* Fixed issue [#768](https://github.com/clean-css/clean-css/issues/768) - invalid border-radius property.
+
+[3.4.13 / 2016-05-23](https://github.com/clean-css/clean-css/compare/v3.4.12...v3.4.13)
+==================
+
+* Fixed issue [#734](https://github.com/clean-css/clean-css/issues/769) - Node.js 6.x support.
+
+[3.4.12 / 2016-04-09](https://github.com/clean-css/clean-css/compare/v3.4.11...v3.4.12)
+==================
+
+* Fixed issue [#734](https://github.com/clean-css/clean-css/issues/734) - `--root` option edge case.
+* Fixed issue [#758](https://github.com/clean-css/clean-css/issues/758) - treats empty rule as unmergeable.
+
+[3.4.11 / 2016-04-01](https://github.com/clean-css/clean-css/compare/v3.4.10...v3.4.11)
+==================
+
+* Fixed issue [#738](https://github.com/clean-css/clean-css/issues/738) - edge case in comment processing.
+* Fixed issue [#741](https://github.com/clean-css/clean-css/issues/741) - HTTP proxy with HTTPS inlining.
+* Fixed issue [#743](https://github.com/clean-css/clean-css/issues/743) - background shorthand and source maps.
+* Fixed issue [#745](https://github.com/clean-css/clean-css/issues/745) - matching mixed case `!important`.
+
+[3.4.10 / 2016-02-29](https://github.com/clean-css/clean-css/compare/v3.4.9...v3.4.10)
+==================
+
+* Fixed issue [#735](https://github.com/clean-css/clean-css/issues/735) - whitespace removal with escaped chars.
+
+[3.4.9 / 2016-01-03](https://github.com/clean-css/clean-css/compare/v3.4.8...v3.4.9)
+==================
+
+* Sped up merging by body advanced optimization.
+* Fixed issue [#693](https://github.com/clean-css/clean-css/issues/693) - restructuring edge case.
+* Fixed issue [#711](https://github.com/clean-css/clean-css/issues/711) - border fuzzy matching.
+* Fixed issue [#714](https://github.com/clean-css/clean-css/issues/714) - stringifying property level at rules.
+* Fixed issue [#715](https://github.com/clean-css/clean-css/issues/715) - stack too deep in comment scan.
+
+[3.4.8 / 2015-11-13](https://github.com/clean-css/clean-css/compare/v3.4.7...v3.4.8)
+==================
+
+* Fixed issue [#676](https://github.com/clean-css/clean-css/issues/676) - fuzzy matching unqoted data URIs.
+
+[3.4.7 / 2015-11-10](https://github.com/clean-css/clean-css/compare/v3.4.6...v3.4.7)
+==================
+
+* Fixed issue [#692](https://github.com/clean-css/clean-css/issues/692) - edge case in URL quoting.
+* Fixed issue [#695](https://github.com/clean-css/clean-css/issues/695) - shorthand overriding edge case.
+* Fixed issue [#699](https://github.com/clean-css/clean-css/issues/699) - IE9 transparent hack.
+* Fixed issue [#701](https://github.com/clean-css/clean-css/issues/701) - `url` quoting with hash arguments.
+
+[3.4.6 / 2015-10-14](https://github.com/clean-css/clean-css/compare/v3.4.5...v3.4.6)
+==================
+
+* Fixed issue [#679](https://github.com/clean-css/clean-css/issues/679) - wrong rebasing of remote URLs.
+
+[3.4.5 / 2015-09-28](https://github.com/clean-css/clean-css/compare/v3.4.4...v3.4.5)
+==================
+
+* Fixed issue [#681](https://github.com/clean-css/clean-css/issues/681) - property inheritance & restructuring.
+* Fixed issue [#675](https://github.com/clean-css/clean-css/issues/675) - overriding with `!important`.
+
+[3.4.4 / 2015-09-21](https://github.com/clean-css/clean-css/compare/v3.4.3...v3.4.4)
+==================
+
+* Fixed issue [#626](https://github.com/clean-css/clean-css/issues/626) - edge case in import rebasing.
+* Fixed issue [#674](https://github.com/clean-css/clean-css/issues/674) - adjacent merging order.
+
+[3.4.3 / 2015-09-15](https://github.com/clean-css/clean-css/compare/v3.4.2...v3.4.3)
+==================
+
+* Fixed issue [#668](https://github.com/clean-css/clean-css/issues/668) - node v4 path.join.
+* Fixed issue [#669](https://github.com/clean-css/clean-css/issues/669) - adjacent overriding with `!important`.
+
+[3.4.2 / 2015-09-14](https://github.com/clean-css/clean-css/compare/v3.4.1...v3.4.2)
+==================
+
+* Fixed issue [#598](https://github.com/clean-css/clean-css/issues/598) - restructuring border properties.
+* Fixed issue [#654](https://github.com/clean-css/clean-css/issues/654) - disables length optimizations.
+* Fixed issue [#655](https://github.com/clean-css/clean-css/issues/655) - shorthands override merging.
+* Fixed issue [#660](https://github.com/clean-css/clean-css/issues/660) - !important token overriding.
+* Fixed issue [#662](https://github.com/clean-css/clean-css/issues/662) - !important selector reducing.
+* Fixed issue [#667](https://github.com/clean-css/clean-css/issues/667) - rebasing remote URLs.
+
+[3.4.1 / 2015-08-27](https://github.com/clean-css/clean-css/compare/v3.4.0...v3.4.1)
+==================
+
+* Fixed issue [#652](https://github.com/clean-css/clean-css/issues/652) - order of restoring and removing tokens.
+
+[3.4.0 / 2015-08-27](https://github.com/clean-css/clean-css/compare/v3.3.10...v3.4.0)
+==================
+
+* Adds an option for a fine-grained `@import` control.
+* Adds unit compatibility switches to disable length optimizations.
+* Adds inferring proxy settings from HTTP_PROXY environment variable.
+* Adds support for Polymer / Web Components special selectors.
+* Adds support for Polymer mixins.
+* Adds testing source maps in batch mode.
+* Unifies wrappers for simple & advanced optimizations.
+* Fixed issue [#596](https://github.com/clean-css/clean-css/issues/596) - support for !ie IE<8 hack.
+* Fixed issue [#599](https://github.com/clean-css/clean-css/issues/599) - support for inlined source maps.
+* Fixed issue [#607](https://github.com/clean-css/clean-css/issues/607) - adds better rule reordering.
+* Fixed issue [#612](https://github.com/clean-css/clean-css/issues/612) - adds HTTP proxy support.
+* Fixed issue [#618](https://github.com/clean-css/clean-css/issues/618) - adds safer function validation.
+* Fixed issue [#625](https://github.com/clean-css/clean-css/issues/625) - adds length unit optimizations.
+* Fixed issue [#632](https://github.com/clean-css/clean-css/issues/632) - adds disabling remote `import`s.
+* Fixed issue [#635](https://github.com/clean-css/clean-css/issues/635) - adds safer `0%` optimizations.
+* Fixed issue [#644](https://github.com/clean-css/clean-css/issues/644) - adds time unit optimizations.
+* Fixed issue [#645](https://github.com/clean-css/clean-css/issues/645) - adds bottom to top `media` merging.
+* Fixed issue [#648](https://github.com/clean-css/clean-css/issues/648) - adds property level at-rule support.
+
+[3.3.10 / 2015-08-27](https://github.com/clean-css/clean-css/compare/v3.3.9...v3.3.10)
+==================
+
+* Adds better comments + keepBreaks handling.
+* Adds better text normalizing in source maps mode.
+* Fixes non-adjacent optimizations for source maps.
+* Fixes removing unused items.
+* Improves `outline` break up with source maps.
+* Refixed issue [#629](https://github.com/clean-css/clean-css/issues/629) - source maps & background shorthands.
+
+[3.3.9 / 2015-08-09](https://github.com/clean-css/clean-css/compare/v3.3.8...v3.3.9)
+==================
+
+* Fixed issue [#640](https://github.com/clean-css/clean-css/issues/640) - URI processing regression.
+
+[3.3.8 / 2015-08-06](https://github.com/clean-css/clean-css/compare/v3.3.7...v3.3.8)
+==================
+
+* Fixed issue [#629](https://github.com/clean-css/clean-css/issues/629) - source maps & background shorthands.
+* Fixed issue [#630](https://github.com/clean-css/clean-css/issues/630) - vendor prefixed flex optimizations.
+* Fixed issue [#633](https://github.com/clean-css/clean-css/issues/633) - handling data URI with brackets.
+* Fixed issue [#634](https://github.com/clean-css/clean-css/issues/634) - merging :placeholder selectors.
+
+[3.3.7 / 2015-07-29](https://github.com/clean-css/clean-css/compare/v3.3.6...v3.3.7)
+==================
+
+* Fixed issue [#616](https://github.com/clean-css/clean-css/issues/616) - ordering in restructuring.
+
+[3.3.6 / 2015-07-14](https://github.com/clean-css/clean-css/compare/v3.3.5...v3.3.6)
+==================
+
+* Fixed issue [#620](https://github.com/clean-css/clean-css/issues/620) - `bold` style in font shorthands.
+
+[3.3.5 / 2015-07-01](https://github.com/clean-css/clean-css/compare/v3.3.4...v3.3.5)
+==================
+
+* Fixed issue [#608](https://github.com/clean-css/clean-css/issues/608) - custom URI protocols handling.
+
+[3.3.4 / 2015-06-24](https://github.com/clean-css/clean-css/compare/v3.3.3...v3.3.4)
+==================
+
+* Fixed issue [#610](https://github.com/clean-css/clean-css/issues/610) - `border:inherit` restoring.
+* Fixed issue [#611](https://github.com/clean-css/clean-css/issues/611) - edge case in quote stripping.
+
+[3.3.3 / 2015-06-16](https://github.com/clean-css/clean-css/compare/v3.3.2...v3.3.3)
+==================
+
+* Fixed issue [#603](https://github.com/clean-css/clean-css/issues/603) - IE suffix hack defaults to on.
+
+[3.3.2 / 2015-06-14](https://github.com/clean-css/clean-css/compare/v3.3.1...v3.3.2)
+==================
+
+* Fixed issue [#595](https://github.com/clean-css/clean-css/issues/595) - more relaxed block matching.
+* Fixed issue [#601](https://github.com/clean-css/clean-css/issues/601) - percentage minifying inside `flex`.
+* Fixed issue [#602](https://github.com/clean-css/clean-css/issues/602) - backslash IE hacks after a space.
+
+[3.3.1 / 2015-06-02](https://github.com/clean-css/clean-css/compare/v3.3.0...v3.3.1)
+==================
+
+* Fixed issue [#590](https://github.com/clean-css/clean-css/issues/590) - edge case in `@import` processing.
+
+[3.3.0 / 2015-05-31](https://github.com/clean-css/clean-css/compare/v3.2.11...v3.3.0)
+==================
+
+* Cleans up url rebase code getting rid of unnecessary state.
+* Cleans up tokenizer code getting rid of unnecessary state.
+* Moves source maps tracker into lib/source-maps/track.
+* Moves tokenizer code into lib/tokenizer.
+* Moves URL scanner into lib/urls/reduce (was named incorrectly before).
+* Moves URL rebasing & rewriting into lib/urls.
+* Fixed issue [#375](https://github.com/clean-css/clean-css/issues/375) - unit compatibility switches.
+* Fixed issue [#436](https://github.com/clean-css/clean-css/issues/436) - refactors URI rewriting.
+* Fixed issue [#448](https://github.com/clean-css/clean-css/issues/448) - rebasing no protocol URIs.
+* Fixed issue [#517](https://github.com/clean-css/clean-css/issues/517) - turning off color optimizations.
+* Fixed issue [#542](https://github.com/clean-css/clean-css/issues/542) - space after closing brace in IE.
+* Fixed issue [#562](https://github.com/clean-css/clean-css/issues/562) - optimizing invalid color values.
+* Fixed issue [#563](https://github.com/clean-css/clean-css/issues/563) - `background:inherit` restoring.
+* Fixed issue [#570](https://github.com/clean-css/clean-css/issues/570) - rebasing "no-url()" imports.
+* Fixed issue [#574](https://github.com/clean-css/clean-css/issues/574) - rewriting internal URLs.
+* Fixed issue [#575](https://github.com/clean-css/clean-css/issues/575) - missing directory as a `target`.
+* Fixed issue [#577](https://github.com/clean-css/clean-css/issues/577) - `background-clip` into shorthand.
+* Fixed issue [#579](https://github.com/clean-css/clean-css/issues/579) - `background-origin` into shorthand.
+* Fixed issue [#580](https://github.com/clean-css/clean-css/issues/580) - mixed `@import` processing.
+* Fixed issue [#582](https://github.com/clean-css/clean-css/issues/582) - overriding with prefixed values.
+* Fixed issue [#583](https://github.com/clean-css/clean-css/issues/583) - URL quoting for SVG data.
+* Fixed issue [#587](https://github.com/clean-css/clean-css/issues/587) - too aggressive `border` reordering.
+
+[3.2.11 / 2015-05-31](https://github.com/clean-css/clean-css/compare/v3.2.10...v3.2.11)
+==================
+
+* Fixed issue [#563](https://github.com/clean-css/clean-css/issues/563) - `background:inherit` restoring.
+* Fixed issue [#582](https://github.com/clean-css/clean-css/issues/582) - overriding with prefixed values.
+* Fixed issue [#583](https://github.com/clean-css/clean-css/issues/583) - URL quoting for SVG data.
+* Fixed issue [#587](https://github.com/clean-css/clean-css/issues/587) - too aggressive `border` reordering.
+
+[3.2.10 / 2015-05-14](https://github.com/clean-css/clean-css/compare/v3.2.9...v3.2.10)
+==================
+
+* Fixed issue [#572](https://github.com/clean-css/clean-css/issues/572) - empty elements removal.
+
+[3.2.9 / 2015-05-08](https://github.com/clean-css/clean-css/compare/v3.2.8...v3.2.9)
+==================
+
+* Fixed issue [#567](https://github.com/clean-css/clean-css/issues/567) - merging colors as functions.
+
+[3.2.8 / 2015-05-04](https://github.com/clean-css/clean-css/compare/v3.2.7...v3.2.8)
+==================
+
+* Fixed issue [#561](https://github.com/clean-css/clean-css/issues/561) - restructuring special selectors.
+
+[3.2.7 / 2015-05-03](https://github.com/clean-css/clean-css/compare/v3.2.6...v3.2.7)
+==================
+
+* Fixed issue [#551](https://github.com/clean-css/clean-css/issues/551) - edge case in restructuring.
+* Fixed issue [#553](https://github.com/clean-css/clean-css/issues/553) - another style of SVG fallback.
+* Fixed issue [#558](https://github.com/clean-css/clean-css/issues/558) - units in same selector merging.
+
+[3.2.6 / 2015-04-28](https://github.com/clean-css/clean-css/compare/v3.2.5...v3.2.6)
+==================
+
+* Fixed issue [#550](https://github.com/clean-css/clean-css/issues/550) - proper `contentSources` tracking.
+* Fixed issue [#556](https://github.com/clean-css/clean-css/issues/556) - regression in IE backslash hacks.
+
+[3.2.5 / 2015-04-25](https://github.com/clean-css/clean-css/compare/v3.2.4...v3.2.5)
+==================
+
+* Fixed issue [#543](https://github.com/clean-css/clean-css/issues/543) - better "comment in body" handling.
+* Fixed issue [#548](https://github.com/clean-css/clean-css/issues/548) - regression in font minifying.
+* Fixed issue [#549](https://github.com/clean-css/clean-css/issues/549) - special comments in source maps.
+
+[3.2.4 / 2015-04-24](https://github.com/clean-css/clean-css/compare/v3.2.3...v3.2.4)
+==================
+
+* Fixed issue [#544](https://github.com/clean-css/clean-css/issues/544) - regression in same value merging.
+* Fixed issue [#546](https://github.com/clean-css/clean-css/issues/546) - IE<11 `calc()` issue.
+
+[3.2.3 / 2015-04-22](https://github.com/clean-css/clean-css/compare/v3.2.2...v3.2.3)
+==================
+
+* Fixed issue [#541](https://github.com/clean-css/clean-css/issues/541) - `outline-style:auto` in shorthand.
+
+[3.2.2 / 2015-04-21](https://github.com/clean-css/clean-css/compare/v3.2.1...v3.2.2)
+==================
+
+* Fixed issue [#537](https://github.com/clean-css/clean-css/issues/537) - regression in simple optimizer.
+
+[3.2.1 / 2015-04-20](https://github.com/clean-css/clean-css/compare/v3.2.0...v3.2.1)
+==================
+
+* Fixed issue [#534](https://github.com/clean-css/clean-css/issues/534) - wrong `@font-face` stringifying.
+
+[3.2.0 / 2015-04-19](https://github.com/clean-css/clean-css/compare/v3.1.9...v3.2.0)
+==================
+
+* Bumps commander to 2.8.x.
+* Fixes remote asset rebasing when passing data as a hash.
+* Improves path resolution inside source maps.
+* Makes `root` option implicitely default to `process.cwd()`.
+* Fixed issue [#371](https://github.com/clean-css/clean-css/issues/371) - `background` fallback with `none`.
+* Fixed issue [#376](https://github.com/clean-css/clean-css/issues/376) - option to disable `0[unit]` -> `0`.
+* Fixed issue [#396](https://github.com/clean-css/clean-css/issues/396) - better input source maps tracking.
+* Fixed issue [#397](https://github.com/clean-css/clean-css/issues/397) - support for source map sources.
+* Fixed issue [#399](https://github.com/clean-css/clean-css/issues/399) - support compacting with source maps.
+* Fixed issue [#429](https://github.com/clean-css/clean-css/issues/429) - unifies data tokenization.
+* Fixed issue [#446](https://github.com/clean-css/clean-css/issues/446) - `list-style` fuzzy matching.
+* Fixed issue [#468](https://github.com/clean-css/clean-css/issues/468) - bumps `source-map` to 0.4.x.
+* Fixed issue [#480](https://github.com/clean-css/clean-css/issues/480) - extracting uppercase property names.
+* Fixed issue [#487](https://github.com/clean-css/clean-css/issues/487) - source map paths under Windows.
+* Fixed issue [#490](https://github.com/clean-css/clean-css/issues/490) - vendor prefixed multivalue `background`.
+* Fixed issue [#500](https://github.com/clean-css/clean-css/issues/500) - merging duplicate adjacent properties.
+* Fixed issue [#504](https://github.com/clean-css/clean-css/issues/504) - keeping `url()` quotes.
+* Fixed issue [#507](https://github.com/clean-css/clean-css/issues/507) - merging longhands into many shorthands.
+* Fixed issue [#508](https://github.com/clean-css/clean-css/issues/508) - removing duplicate media queries.
+* Fixed issue [#521](https://github.com/clean-css/clean-css/issues/521) - unit optimizations inside `calc()`.
+* Fixed issue [#524](https://github.com/clean-css/clean-css/issues/524) - timeouts in `@import` inlining.
+* Fixed issue [#526](https://github.com/clean-css/clean-css/issues/526) - shorthand overriding into a function.
+* Fixed issue [#528](https://github.com/clean-css/clean-css/issues/528) - better support for IE<9 hacks.
+* Fixed issue [#529](https://github.com/clean-css/clean-css/issues/529) - wrong font weight minification.
+
+[3.1.9 / 2015-04-04](https://github.com/clean-css/clean-css/compare/v3.1.8...v3.1.9)
+==================
+
+* Fixes issue [#511](https://github.com/clean-css/clean-css/issues/511) - `)` advanced processing.
+
+[3.1.8 / 2015-03-17](https://github.com/clean-css/clean-css/compare/v3.1.7...v3.1.8)
+==================
+
+* Fixes issue [#498](https://github.com/clean-css/clean-css/issues/498) - reordering and flexbox.
+* Fixes issue [#499](https://github.com/clean-css/clean-css/issues/499) - too aggressive `-` removal.
+
+[3.1.7 / 2015-03-16](https://github.com/clean-css/clean-css/compare/v3.1.6...v3.1.7)
+==================
+
+* Backports fix to [#480](https://github.com/clean-css/clean-css/issues/480) - reordering and uppercase properties.
+* Fixes issue [#496](https://github.com/clean-css/clean-css/issues/496) - space after bracket removal.
+
+[3.1.6 / 2015-03-12](https://github.com/clean-css/clean-css/compare/v3.1.5...v3.1.6)
+==================
+
+* Fixes issue [#489](https://github.com/clean-css/clean-css/issues/489) - `AlphaImageLoader` IE filter.
+
+[3.1.5 / 2015-03-06](https://github.com/clean-css/clean-css/compare/v3.1.4...v3.1.5)
+==================
+
+* Fixes issue [#483](https://github.com/clean-css/clean-css/issues/483) - property order in restructuring.
+
+[3.1.4 / 2015-03-04](https://github.com/clean-css/clean-css/compare/v3.1.3...v3.1.4)
+==================
+
+* Fixes issue [#472](https://github.com/clean-css/clean-css/issues/472) - broken function minification.
+* Fixes issue [#477](https://github.com/clean-css/clean-css/issues/477) - `@import`s order in restructuring.
+* Fixes issue [#478](https://github.com/clean-css/clean-css/issues/478) - ultimate fix to brace whitespace.
+
+[3.1.3 / 2015-03-03](https://github.com/clean-css/clean-css/compare/v3.1.2...v3.1.3)
+==================
+
+* Fixes issue [#464](https://github.com/clean-css/clean-css/issues/464) - data URI with quoted braces.
+* Fixes issue [#475](https://github.com/clean-css/clean-css/issues/475) - whitespace after closing brace.
+
+[3.1.2 / 2015-03-01](https://github.com/clean-css/clean-css/compare/v3.1.1...v3.1.2)
+==================
+
+* Refixed issue [#471](https://github.com/clean-css/clean-css/issues/471) - correct order after restructuring.
+* Fixes issue [#466](https://github.com/clean-css/clean-css/issues/466) - rebuilding background shorthand.
+* Fixes issue [#462](https://github.com/clean-css/clean-css/issues/462) - escaped apostrophes in selectors.
+
+[3.1.1 / 2015-02-27](https://github.com/clean-css/clean-css/compare/v3.1.0...v3.1.1)
+==================
+
+* Fixed issue [#469](https://github.com/clean-css/clean-css/issues/469) - extracting broken property.
+* Fixed issue [#470](https://github.com/clean-css/clean-css/issues/470) - negative padding removal.
+* Fixed issue [#471](https://github.com/clean-css/clean-css/issues/471) - correct order after restructuring.
+
+[3.1.0 / 2015-02-26](https://github.com/clean-css/clean-css/compare/v3.0.10...v3.1.0)
+==================
+
+* Adds `0deg` to `0` minification where possible.
+* Adds better non-adjacent selector merging when body is the same.
+* Adds official support for node.js 0.12.
+* Adds official support for io.js 1.0.
+* Adds restructuring optimizations to reorganize selectors, which vastly improves minification.
+* Fixed issue [#158](https://github.com/clean-css/clean-css/issues/158) - adds body-based selectors reduction.
+* Fixed issue [#182](https://github.com/clean-css/clean-css/issues/182) - removing space after closing brace.
+* Fixed issue [#204](https://github.com/clean-css/clean-css/issues/204) - `@media` merging.
+* Fixed issue [#351](https://github.com/clean-css/clean-css/issues/351) - remote `@import`s after content.
+* Fixed issue [#357](https://github.com/clean-css/clean-css/issues/357) - non-standard but valid URLs.
+* Fixed issue [#416](https://github.com/clean-css/clean-css/issues/416) - accepts hash as `minify` argument.
+* Fixed issue [#419](https://github.com/clean-css/clean-css/issues/419) - multiple input source maps.
+* Fixed issue [#435](https://github.com/clean-css/clean-css/issues/435) - `background-clip` in shorthand.
+* Fixed issue [#439](https://github.com/clean-css/clean-css/issues/439) - `background-origin` in shorthand.
+* Fixed issue [#442](https://github.com/clean-css/clean-css/issues/442) - space before adjacent `nav`.
+* Fixed issue [#445](https://github.com/clean-css/clean-css/issues/445) - regression issue in url processor.
+* Fixed issue [#449](https://github.com/clean-css/clean-css/issues/449) - warns of missing close braces.
+* Fixed issue [#463](https://github.com/clean-css/clean-css/issues/463) - relative remote `@import` URLs.
+
+[3.0.10 / 2015-02-07](https://github.com/clean-css/clean-css/compare/v3.0.9...v3.0.10)
+==================
+
+* Fixed issue [#453](https://github.com/clean-css/clean-css/issues/453) - double `background-repeat`.
+* Fixed issue [#455](https://github.com/clean-css/clean-css/issues/455) - property extracting regression.
+
+[3.0.9 / 2015-02-04](https://github.com/clean-css/clean-css/compare/v3.0.8...v3.0.9)
+==================
+
+* Fixed issue [#452](https://github.com/clean-css/clean-css/issues/452) - regression in advanced merging.
+
+[3.0.8 / 2015-01-31](https://github.com/clean-css/clean-css/compare/v3.0.7...v3.0.8)
+==================
+
+* Fixed issue [#447](https://github.com/clean-css/clean-css/issues/447) - `background-color` in shorthands.
+* Fixed issue [#450](https://github.com/clean-css/clean-css/issues/450) - name to hex color converting.
+
+[3.0.7 / 2015-01-22](https://github.com/clean-css/clean-css/compare/v3.0.6...v3.0.7)
+==================
+
+* Fixed issue [#441](https://github.com/clean-css/clean-css/issues/441) - hex to name color converting.
+
+[3.0.6 / 2015-01-20](https://github.com/clean-css/clean-css/compare/v3.0.5...v3.0.6)
+==================
+
+* Refixed issue [#414](https://github.com/clean-css/clean-css/issues/414) - source maps position fallback.
+
+[3.0.5 / 2015-01-18](https://github.com/clean-css/clean-css/compare/v3.0.4...v3.0.5)
+==================
+
+* Fixed issue [#414](https://github.com/clean-css/clean-css/issues/414) - source maps position fallback.
+* Fixed issue [#433](https://github.com/clean-css/clean-css/issues/433) - meging `!important` in shorthands.
+
+[3.0.4 / 2015-01-11](https://github.com/clean-css/clean-css/compare/v3.0.3...v3.0.4)
+==================
+
+* Fixed issue [#314](https://github.com/clean-css/clean-css/issues/314) - spaces inside `calc`.
+
+[3.0.3 / 2015-01-07](https://github.com/clean-css/clean-css/compare/v3.0.2...v3.0.3)
+==================
+
+* Just a version bump as npm incorrectly things 2.2.23 is the latest one.
+
+[3.0.2 / 2015-01-04](https://github.com/clean-css/clean-css/compare/v3.0.1...v3.0.2)
+==================
+
+* Fixed issue [#422](https://github.com/clean-css/clean-css/issues/422) - handling `calc` as a unit.
+
+[3.0.1 / 2014-12-19](https://github.com/clean-css/clean-css/compare/v3.0.0...v3.0.1)
+==================
+
+* Fixed issue [#410](https://github.com/clean-css/clean-css/issues/410) - advanced merging and comments.
+* Fixed issue [#411](https://github.com/clean-css/clean-css/issues/411) - properties and important comments.
+
+[3.0.0 / 2014-12-18](https://github.com/clean-css/clean-css/compare/v2.2.22...v3.0.0)
+==================
+
+* Adds more granular control over compatibility settings.
+* Adds support for @counter-style at-rule.
+* Adds `--source-map`/`sourceMap` switch for building input's source map.
+* Adds `--skip-shorthand-compacting`/`shorthandComacting` option for disabling shorthand compacting.
+* Allows `target` option to be a path to a folder instead of a file.
+* Allows disabling rounding precision. By [@superlukas](https://github.com/superlukas).
+* Breaks 2.x compatibility for using CleanCSS as a function.
+* Changes `minify` method output to handle multiple outputs.
+* Reworks minification to tokenize first then minify.
+  See [changes](https://github.com/clean-css/clean-css/compare/b06f37d...dd8c14a).
+* Removes support for node.js 0.8.x.
+* Renames `noAdvanced` option into `advanced`.
+* Renames `noAggressiveMerging` option into `aggressiveMerging`.
+* Renames `noRebase` option into `rebase`.
+* Speeds up advanced processing by shortening optimize loop.
+* Fixed issue [#125](https://github.com/clean-css/clean-css/issues/125) - source maps!
+* Fixed issue [#344](https://github.com/clean-css/clean-css/issues/344) - merging `background-size` into shorthand.
+* Fixed issue [#352](https://github.com/clean-css/clean-css/issues/352) - honors rebasing in imported stylesheets.
+* Fixed issue [#360](https://github.com/clean-css/clean-css/issues/360) - adds 7 extra CSS colors.
+* Fixed issue [#363](https://github.com/clean-css/clean-css/issues/363) - `rem` units overriding `px`.
+* Fixed issue [#373](https://github.com/clean-css/clean-css/issues/373) - proper `background` shorthand merging.
+* Fixed issue [#395](https://github.com/clean-css/clean-css/issues/395) - unescaped brackets in data URIs.
+* Fixed issue [#398](https://github.com/clean-css/clean-css/issues/398) - restoring important comments.
+* Fixed issue [#400](https://github.com/clean-css/clean-css/issues/400) - API to accept an array of filenames.
+* Fixed issue [#403](https://github.com/clean-css/clean-css/issues/403) - tracking input files in source maps.
+* Fixed issue [#404](https://github.com/clean-css/clean-css/issues/404) - no state sharing in API.
+* Fixed issue [#405](https://github.com/clean-css/clean-css/issues/405) - disables default `background-size` merging.
+* Refixed issue [#304](https://github.com/clean-css/clean-css/issues/304) - `background-position` merging.
+
+[2.2.22 / 2014-12-13](https://github.com/clean-css/clean-css/compare/v2.2.21...v2.2.22)
+==================
+
+* Backports fix to issue [#304](https://github.com/clean-css/clean-css/issues/304) - `background-position` merging.
+
+[2.2.21 / 2014-12-10](https://github.com/clean-css/clean-css/compare/v2.2.20...v2.2.21)
+==================
+
+* Backports fix to issue [#373](https://github.com/clean-css/clean-css/issues/373) - `background` shorthand merging.
+
+[2.2.20 / 2014-12-02](https://github.com/clean-css/clean-css/compare/v2.2.19...v2.2.20)
+==================
+
+* Backports fix to issue [#390](https://github.com/clean-css/clean-css/issues/390) - pseudo-class merging.
+
+[2.2.19 / 2014-11-20](https://github.com/clean-css/clean-css/compare/v2.2.18...v2.2.19)
+==================
+
+* Fixed issue [#385](https://github.com/clean-css/clean-css/issues/385) - edge cases in processing cut off data.
+
+[2.2.18 / 2014-11-17](https://github.com/clean-css/clean-css/compare/v2.2.17...v2.2.18)
+==================
+
+* Fixed issue [#383](https://github.com/clean-css/clean-css/issues/383) - rounding fractions once again.
+
+[2.2.17 / 2014-11-09](https://github.com/clean-css/clean-css/compare/v2.2.16...v2.2.17)
+==================
+
+* Fixed issue [#380](https://github.com/clean-css/clean-css/issues/380) - rounding fractions to a whole number.
+
+[2.2.16 / 2014-09-16](https://github.com/clean-css/clean-css/compare/v2.2.15...v2.2.16)
+==================
+
+* Fixed issue [#359](https://github.com/clean-css/clean-css/issues/359) - handling escaped double backslash.
+* Fixed issue [#358](https://github.com/clean-css/clean-css/issues/358) - property merging in compatibility mode.
+* Fixed issue [#356](https://github.com/clean-css/clean-css/issues/356) - preserving `*+html` hack.
+* Fixed issue [#354](https://github.com/clean-css/clean-css/issues/354) - `!important` overriding in shorthands.
+
+[2.2.15 / 2014-09-01](https://github.com/clean-css/clean-css/compare/v2.2.14...v2.2.15)
+==================
+
+* Fixed issue [#343](https://github.com/clean-css/clean-css/issues/343) - too aggressive `rgba`/`hsla` minification.
+* Fixed issue [#345](https://github.com/clean-css/clean-css/issues/345) - URL rebasing for document relative ones.
+* Fixed issue [#346](https://github.com/clean-css/clean-css/issues/346) - overriding `!important` by `!important`.
+* Fixed issue [#350](https://github.com/clean-css/clean-css/issues/350) - edge cases in `@import` processing.
+
+[2.2.14 / 2014-08-25](https://github.com/clean-css/clean-css/compare/v2.2.13...v2.2.14)
+==================
+
+* Makes multival operations idempotent.
+* Fixed issue [#339](https://github.com/clean-css/clean-css/issues/339) - skips invalid properties.
+* Fixed issue [#341](https://github.com/clean-css/clean-css/issues/341) - ensure output is shorter than input.
+
+[2.2.13 / 2014-08-12](https://github.com/clean-css/clean-css/compare/v2.2.12...v2.2.13)
+==================
+
+* Fixed issue [#337](https://github.com/clean-css/clean-css/issues/337) - handling component importance.
+
+[2.2.12 / 2014-08-02](https://github.com/clean-css/clean-css/compare/v2.2.11...v2.2.12)
+==================
+
+* Fixed issue with tokenizer removing first selector after an unknown @ rule.
+* Fixed issue [#329](https://github.com/clean-css/clean-css/issues/329) - `font` shorthands incorrectly processed.
+* Fixed issue [#332](https://github.com/clean-css/clean-css/issues/332) - `background` shorthand with colors.
+* Refixed issue [#325](https://github.com/clean-css/clean-css/issues/325) - invalid charset declarations.
+
+[2.2.11 / 2014-07-28](https://github.com/clean-css/clean-css/compare/v2.2.10...v2.2.11)
+==================
+
+* Fixed issue [#326](https://github.com/clean-css/clean-css/issues/326) - `background-size` regression.
+
+[2.2.10 / 2014-07-27](https://github.com/clean-css/clean-css/compare/v2.2.9...v2.2.10)
+==================
+
+* Improved performance of advanced mode validators.
+* Fixed issue [#307](https://github.com/clean-css/clean-css/issues/307) - `background-color` in multiple backgrounds.
+* Fixed issue [#322](https://github.com/clean-css/clean-css/issues/322) - adds `background-size` support.
+* Fixed issue [#323](https://github.com/clean-css/clean-css/issues/323) - stripping variable references.
+* Fixed issue [#325](https://github.com/clean-css/clean-css/issues/325) - removing invalid `@charset` declarations.
+
+[2.2.9 / 2014-07-23](https://github.com/clean-css/clean-css/compare/v2.2.8...v2.2.9)
+==================
+
+* Adds `background` normalization according to W3C spec.
+* Fixed issue [#316](https://github.com/clean-css/clean-css/issues/316) - incorrect `background` processing.
+
+[2.2.8 / 2014-07-14](https://github.com/clean-css/clean-css/compare/v2.2.7...v2.2.8)
+==================
+
+* Fixed issue [#313](https://github.com/clean-css/clean-css/issues/313) - processing comment marks in URLs.
+* Fixed issue [#315](https://github.com/clean-css/clean-css/issues/315) - `rgba`/`hsla` -> `transparent` in gradients.
+
+[2.2.7 / 2014-07-10](https://github.com/clean-css/clean-css/compare/v2.2.6...v2.2.7)
+==================
+
+* Fixed issue [#304](https://github.com/clean-css/clean-css/issues/304) - merging multiple backgrounds.
+* Fixed issue [#312](https://github.com/clean-css/clean-css/issues/312) - merging with mixed repeat.
+
+[2.2.6 / 2014-07-05](https://github.com/clean-css/clean-css/compare/v2.2.5...v2.2.6)
+==================
+
+* Adds faster quote matching in QuoteScanner.
+* Improves QuoteScanner to handle comments correctly.
+* Fixed issue [#308](https://github.com/clean-css/clean-css/issues/308) - parsing comments in quoted URLs.
+* Fixed issue [#311](https://github.com/clean-css/clean-css/issues/311) - leading/trailing decimal points.
+
+[2.2.5 / 2014-06-29](https://github.com/clean-css/clean-css/compare/v2.2.4...v2.2.5)
+==================
+
+* Adds removing extra spaces around / in border-radius.
+* Adds replacing same horizontal & vertical value in border-radius.
+* Fixed issue [#305](https://github.com/clean-css/clean-css/issues/305) - allows width keywords in `border-width`.
+
+[2.2.4 / 2014-06-27](https://github.com/clean-css/clean-css/compare/v2.2.3...v2.2.4)
+==================
+
+* Fixed issue [#301](https://github.com/clean-css/clean-css/issues/301) - proper `border-radius` processing.
+* Fixed issue [#303](https://github.com/clean-css/clean-css/issues/303) - correctly preserves viewport units.
+
+[2.2.3 / 2014-06-24](https://github.com/clean-css/clean-css/compare/v2.2.2...v2.2.3)
+==================
+
+* Fixed issue [#302](https://github.com/clean-css/clean-css/issues/302) - handling of `outline-style: auto`.
+
+[2.2.2 / 2014-06-18](https://github.com/clean-css/clean-css/compare/v2.2.1...v2.2.2)
+==================
+
+* Fixed issue [#297](https://github.com/clean-css/clean-css/issues/297) - `box-shadow` zeros minification.
+
+[2.2.1 / 2014-06-14](https://github.com/clean-css/clean-css/compare/v2.2.0...v2.2.1)
+==================
+
+* Fixes new property optimizer for 'none' values.
+* Fixed issue [#294](https://github.com/clean-css/clean-css/issues/294) - space after `rgba`/`hsla` in IE<=11.
+
+[2.2.0 / 2014-06-11](https://github.com/clean-css/clean-css/compare/v2.1.8...v2.2.0)
+==================
+
+* Adds a better algorithm for quotation marks' removal.
+* Adds a better non-adjacent optimizer compatible with the upcoming new property optimizer.
+* Adds minifying remote files directly from CLI.
+* Adds `--rounding-precision` to control rounding precision.
+* Moves quotation matching into a `QuoteScanner` class.
+* Adds `npm run browserify` for creating embeddable version of clean-css.
+* Fixed list-style-* advanced processing.
+* Fixed issue [#134](https://github.com/clean-css/clean-css/issues/134) - merges properties into shorthand form.
+* Fixed issue [#164](https://github.com/clean-css/clean-css/issues/164) - removes default values if not needed.
+* Fixed issue [#168](https://github.com/clean-css/clean-css/issues/168) - adds better property merging algorithm.
+* Fixed issue [#173](https://github.com/clean-css/clean-css/issues/173) - merges same properties if grouped.
+* Fixed issue [#184](https://github.com/clean-css/clean-css/issues/184) - uses `!important` for optimization opportunities.
+* Fixed issue [#190](https://github.com/clean-css/clean-css/issues/190) - uses shorthand to override another shorthand.
+* Fixed issue [#197](https://github.com/clean-css/clean-css/issues/197) - adds borders merging by understandability.
+* Fixed issue [#210](https://github.com/clean-css/clean-css/issues/210) - adds temporary workaround for aggressive merging.
+* Fixed issue [#246](https://github.com/clean-css/clean-css/issues/246) - removes IE hacks when not in compatibility mode.
+* Fixed issue [#247](https://github.com/clean-css/clean-css/issues/247) - removes deprecated `selectorsMergeMode` switch.
+* Refixed issue [#250](https://github.com/clean-css/clean-css/issues/250) - based on new quotation marks removal.
+* Fixed issue [#257](https://github.com/clean-css/clean-css/issues/257) - turns `rgba`/`hsla` to `transparent` if possible.
+* Fixed issue [#265](https://github.com/clean-css/clean-css/issues/265) - adds support for multiple input files.
+* Fixed issue [#275](https://github.com/clean-css/clean-css/issues/275) - handling transform properties.
+* Fixed issue [#276](https://github.com/clean-css/clean-css/issues/276) - corrects unicode handling.
+* Fixed issue [#288](https://github.com/clean-css/clean-css/issues/288) - adds smarter expression parsing.
+* Fixed issue [#293](https://github.com/clean-css/clean-css/issues/293) - handles escaped `@` symbols in class names and IDs.
+
+[2.1.8 / 2014-03-28](https://github.com/clean-css/clean-css/compare/v2.1.7...v2.1.8)
+==================
+
+* Fixed issue [#267](https://github.com/clean-css/clean-css/issues/267) - incorrect non-adjacent selector merging.
+
+[2.1.7 / 2014-03-24](https://github.com/clean-css/clean-css/compare/v2.1.6...v2.1.7)
+==================
+
+* Fixed issue [#264](https://github.com/clean-css/clean-css/issues/264) - `@import` statements inside comments.
+
+[2.1.6 / 2014-03-10](https://github.com/clean-css/clean-css/compare/v2.1.5...v2.1.6)
+==================
+
+* Fixed issue [#258](https://github.com/clean-css/clean-css/issues/258) - wrong `@import` handling in `EmptyRemoval`.
+
+[2.1.5 / 2014-03-07](https://github.com/clean-css/clean-css/compare/v2.1.4...v2.1.5)
+==================
+
+* Fixed issue [#255](https://github.com/clean-css/clean-css/issues/255) - incorrect processing of a trailing `-0`.
+
+[2.1.4 / 2014-03-01](https://github.com/clean-css/clean-css/compare/v2.1.3...v2.1.4)
+==================
+
+* Fixed issue [#250](https://github.com/clean-css/clean-css/issues/250) - correctly handle JSON data in quotations.
+
+[2.1.3 / 2014-02-26](https://github.com/clean-css/clean-css/compare/v2.1.2...v2.1.3)
+==================
+
+* Fixed issue [#248](https://github.com/clean-css/clean-css/issues/248) - incorrect merging for vendor selectors.
+
+[2.1.2 / 2014-02-25](https://github.com/clean-css/clean-css/compare/v2.1.1...v2.1.2)
+==================
+
+* Fixed issue [#245](https://github.com/clean-css/clean-css/issues/245) - incorrect handling of backslash IE hack.
+
+[2.1.1 / 2014-02-18](https://github.com/clean-css/clean-css/compare/v2.1.0...v2.1.1)
+==================
+
+* Adds faster selectors processing in advanced optimizer.
+* Fixed issue [#241](https://github.com/clean-css/clean-css/issues/241) - incorrect handling of `:not()` selectors.
+
+[2.1.0 / 2014-02-13](https://github.com/clean-css/clean-css/compare/v2.0.8...v2.1.0)
+==================
+
+* Adds an optional callback to minify method.
+* Deprecates `--selectors-merge-mode` / `selectorsMergeMode` in favor to `--compatibility` / `compatibility`.
+* Fixes debug mode stats for stylesheets using `@import` statements.
+* Skips empty removal if advanced processing is enabled.
+* Fixed issue [#85](https://github.com/clean-css/clean-css/issues/85) - resolving protocol `@import`s.
+* Fixed issue [#160](https://github.com/clean-css/clean-css/issues/160) - re-runs optimizer until a clean pass.
+* Fixed issue [#161](https://github.com/clean-css/clean-css/issues/161) - improves tokenizer performance.
+* Fixed issue [#163](https://github.com/clean-css/clean-css/issues/163) - round pixels to 2nd decimal place.
+* Fixed issue [#165](https://github.com/clean-css/clean-css/issues/165) - extra space after trailing parenthesis.
+* Fixed issue [#186](https://github.com/clean-css/clean-css/issues/186) - strip unit from `0rem`.
+* Fixed issue [#207](https://github.com/clean-css/clean-css/issues/207) - bug in parsing protocol `@import`s.
+* Fixed issue [#213](https://github.com/clean-css/clean-css/issues/213) - faster `rgb` to `hex` transforms.
+* Fixed issue [#215](https://github.com/clean-css/clean-css/issues/215) - leading zeros in numerical values.
+* Fixed issue [#217](https://github.com/clean-css/clean-css/issues/217) - whitespace inside attribute selectors and URLs.
+* Fixed issue [#218](https://github.com/clean-css/clean-css/issues/218) - `@import` statements cleanup.
+* Fixed issue [#220](https://github.com/clean-css/clean-css/issues/220) - selector between comments.
+* Fixed issue [#223](https://github.com/clean-css/clean-css/issues/223) - two-pass adjacent selectors merging.
+* Fixed issue [#226](https://github.com/clean-css/clean-css/issues/226) - don't minify `border:none` to `border:0`.
+* Fixed issue [#229](https://github.com/clean-css/clean-css/issues/229) - improved processing of fraction numbers.
+* Fixed issue [#230](https://github.com/clean-css/clean-css/issues/230) - better handling of zero values.
+* Fixed issue [#235](https://github.com/clean-css/clean-css/issues/235) - IE7 compatibility mode.
+* Fixed issue [#236](https://github.com/clean-css/clean-css/issues/236) - incorrect rebasing with nested `import`s.
+
+[2.0.8 / 2014-02-07](https://github.com/clean-css/clean-css/compare/v2.0.7...v2.0.8)
+==================
+
+* Fixed issue [#232](https://github.com/clean-css/clean-css/issues/232) - edge case in non-adjacent selectors merging.
+
+[2.0.7 / 2014-01-16](https://github.com/clean-css/clean-css/compare/v2.0.6...v2.0.7)
+==================
+
+* Fixed issue [#208](https://github.com/clean-css/clean-css/issues/208) - don't swallow `@page` and `@viewport`.
+
+[2.0.6 / 2014-01-04](https://github.com/clean-css/clean-css/compare/v2.0.5...v2.0.6)
+==================
+
+* Fixed issue [#198](https://github.com/clean-css/clean-css/issues/198) - process comments and `@import`s correctly.
+* Fixed issue [#205](https://github.com/clean-css/clean-css/issues/205) - freeze on broken `@import` declaration.
+
+[2.0.5 / 2014-01-03](https://github.com/clean-css/clean-css/compare/v2.0.4...v2.0.5)
+==================
+
+* Fixed issue [#199](https://github.com/clean-css/clean-css/issues/199) - keep line breaks with no advanced optimizations.
+* Fixed issue [#203](https://github.com/clean-css/clean-css/issues/203) - Buffer as a first argument to minify method.
+
+[2.0.4 / 2013-12-19](https://github.com/clean-css/clean-css/compare/v2.0.3...v2.0.4)
+==================
+
+* Fixed issue [#193](https://github.com/clean-css/clean-css/issues/193) - HSL color space normalization.
+
+[2.0.3 / 2013-12-18](https://github.com/clean-css/clean-css/compare/v2.0.2...v2.0.3)
+==================
+
+* Fixed issue [#191](https://github.com/clean-css/clean-css/issues/191) - leading numbers in `font`/`animation` names.
+* Fixed issue [#192](https://github.com/clean-css/clean-css/issues/192) - many `@import`s inside a comment.
+
+[2.0.2 / 2013-11-18](https://github.com/clean-css/clean-css/compare/v2.0.1...v2.0.2)
+==================
+
+* Fixed issue [#177](https://github.com/clean-css/clean-css/issues/177) - process broken content correctly.
+
+[2.0.1 / 2013-11-14](https://github.com/clean-css/clean-css/compare/v2.0.0...v2.0.1)
+==================
+
+* Fixed issue [#176](https://github.com/clean-css/clean-css/issues/176) - hangs on `undefined` keyword.
+
+[2.0.0 / 2013-11-04](https://github.com/clean-css/clean-css/compare/v1.1.7...v2.0.0)
+==================
+
+* Adds simplified and more advanced text escaping / restoring via `EscapeStore` class.
+* Adds simplified and much faster empty elements removal.
+* Adds missing `@import` processing to our benchmark (run via `npm run bench`).
+* Adds CSS tokenizer which will make it possible to optimize content by reordering and/or merging selectors.
+* Adds basic optimizer removing duplicate selectors from a list.
+* Adds merging duplicate properties within a single selector's body.
+* Adds merging adjacent selectors within a scope (single and multiple ones).
+* Changes behavior of `--keep-line-breaks`/`keepBreaks` option to keep breaks after trailing braces only.
+* Makes all multiple selectors ordered alphabetically (aids merging).
+* Adds property overriding so more coarse properties override more granular ones.
+* Adds reducing non-adjacent selectors.
+* Adds `--skip-advanced`/`noAdvanced` switch to disable advanced optimizations.
+* Adds reducing non-adjacent selectors when overridden by more complex selectors.
+* Fixed issue [#138](https://github.com/clean-css/clean-css/issues/138) - makes CleanCSS interface OO.
+* Fixed issue [#139](https://github.com/clean-css/clean-css/issues/138) - consistent error & warning handling.
+* Fixed issue [#145](https://github.com/clean-css/clean-css/issues/145) - debug mode in library too.
+* Fixed issue [#157](https://github.com/clean-css/clean-css/issues/157) - gets rid of `removeEmpty` option.
+* Fixed issue [#159](https://github.com/clean-css/clean-css/issues/159) - escaped quotes inside content.
+* Fixed issue [#162](https://github.com/clean-css/clean-css/issues/162) - strip quotes from Base64 encoded URLs.
+* Fixed issue [#166](https://github.com/clean-css/clean-css/issues/166) - `debug` formatting in CLI
+* Fixed issue [#167](https://github.com/clean-css/clean-css/issues/167) - `background:transparent` minification.
+
+[1.1.7 / 2013-10-28](https://github.com/clean-css/clean-css/compare/v1.1.6...v1.1.7)
+==================
+
+* Fixed issue [#156](https://github.com/clean-css/clean-css/issues/156) - `@import`s inside comments.
+
+[1.1.6 / 2013-10-26](https://github.com/clean-css/clean-css/compare/v1.1.5...v1.1.6)
+==================
+
+* Fixed issue [#155](https://github.com/clean-css/clean-css/issues/155) - broken irregular CSS content.
+
+[1.1.5 / 2013-10-24](https://github.com/clean-css/clean-css/compare/v1.1.4...v1.1.5)
+==================
+
+* Fixed issue [#153](https://github.com/clean-css/clean-css/issues/153) - `keepSpecialComments` `0`/`1` as a string.
+
+[1.1.4 / 2013-10-23](https://github.com/clean-css/clean-css/compare/v1.1.3...v1.1.4)
+==================
+
+* Fixed issue [#152](https://github.com/clean-css/clean-css/issues/152) - adds an option to disable rebasing.
+
+[1.1.3 / 2013-10-04](https://github.com/clean-css/clean-css/compare/v1.1.2...v1.1.3)
+==================
+
+* Fixed issue [#150](https://github.com/clean-css/clean-css/issues/150) - minifying `background:none`.
+
+[1.1.2 / 2013-09-29](https://github.com/clean-css/clean-css/compare/v1.1.1...v1.1.2)
+==================
+
+* Fixed issue [#149](https://github.com/clean-css/clean-css/issues/149) - shorthand `font` property.
+
+[1.1.1 / 2013-09-07](https://github.com/clean-css/clean-css/compare/v1.1.0...v1.1.1)
+==================
+
+* Fixed issue [#144](https://github.com/clean-css/clean-css/issues/144) - skip URLs rebasing by default.
+
+[1.1.0 / 2013-09-06](https://github.com/clean-css/clean-css/compare/v1.0.12...v1.1.0)
+==================
+
+* Renamed lib's `debug` option to `benchmark` when doing per-minification benchmarking.
+* Added simplified comments processing & imports.
+* Fixed issue [#43](https://github.com/clean-css/clean-css/issues/43) - `--debug` switch for minification stats.
+* Fixed issue [#65](https://github.com/clean-css/clean-css/issues/65) - full color name / hex shortening.
+* Fixed issue [#84](https://github.com/clean-css/clean-css/issues/84) - support for `@import` with media queries.
+* Fixed issue [#124](https://github.com/clean-css/clean-css/issues/124) - raise error on broken imports.
+* Fixed issue [#126](https://github.com/clean-css/clean-css/issues/126) - proper CSS expressions handling.
+* Fixed issue [#129](https://github.com/clean-css/clean-css/issues/129) - rebasing imported URLs.
+* Fixed issue [#130](https://github.com/clean-css/clean-css/issues/130) - better code modularity.
+* Fixed issue [#135](https://github.com/clean-css/clean-css/issues/135) - require node.js 0.8+.
+
+[1.0.12 / 2013-07-19](https://github.com/clean-css/clean-css/compare/v1.0.11...v1.0.12)
+===================
+
+* Fixed issue [#121](https://github.com/clean-css/clean-css/issues/121) - ability to skip `@import` processing.
+
+[1.0.11 / 2013-07-08](https://github.com/clean-css/clean-css/compare/v1.0.10...v1.0.11)
+===================
+
+* Fixed issue [#117](https://github.com/clean-css/clean-css/issues/117) - line break escaping in comments.
+
+[1.0.10 / 2013-06-13](https://github.com/clean-css/clean-css/compare/v1.0.9...v1.0.10)
+===================
+
+* Fixed issue [#114](https://github.com/clean-css/clean-css/issues/114) - comments in imported stylesheets.
+
+[1.0.9 / 2013-06-11](https://github.com/clean-css/clean-css/compare/v1.0.8...v1.0.9)
+==================
+
+* Fixed issue [#113](https://github.com/clean-css/clean-css/issues/113) - `@import` in comments.
+
+[1.0.8 / 2013-06-10](https://github.com/clean-css/clean-css/compare/v1.0.7...v1.0.8)
+==================
+
+* Fixed issue [#112](https://github.com/clean-css/clean-css/issues/112) - reducing `box-shadow` zeros.
+
+[1.0.7 / 2013-06-05](https://github.com/clean-css/clean-css/compare/v1.0.6...v1.0.7)
+==================
+
+* Support for `@import` URLs starting with `//`. By [@petetak](https://github.com/petetak).
+
+[1.0.6 / 2013-06-04](https://github.com/clean-css/clean-css/compare/v1.0.5...v1.0.6)
+==================
+
+* Fixed issue [#110](https://github.com/clean-css/clean-css/issues/110) - data URIs in URLs.
+
+[1.0.5 / 2013-05-26](https://github.com/clean-css/clean-css/compare/v1.0.4...v1.0.5)
+==================
+
+* Fixed issue [#107](https://github.com/clean-css/clean-css/issues/107) - data URIs in imported stylesheets.
+
+1.0.4 / 2013-05-23
+==================
+
+* Rewrite relative URLs in imported stylesheets. By [@bluej100](https://github.com/bluej100).
+
+1.0.3 / 2013-05-20
+==================
+
+* Support alternative `@import` syntax with file name not wrapped inside `url()` statement.
+  By [@bluej100](https://github.com/bluej100).
+
+1.0.2 / 2013-04-29
+==================
+
+* Fixed issue [#97](https://github.com/clean-css/clean-css/issues/97) - `--remove-empty` & FontAwesome.
+
+1.0.1 / 2013-04-08
+==================
+
+* Do not pick up `bench` and `test` while building `npm` package.
+  By [@sindresorhus](https://https://github.com/sindresorhus).
+
+1.0.0 / 2013-03-30
+==================
+
+* Fixed issue [#2](https://github.com/clean-css/clean-css/issues/2) - resolving `@import` rules.
+* Fixed issue [#44](https://github.com/clean-css/clean-css/issues/44) - examples in `--help`.
+* Fixed issue [#46](https://github.com/clean-css/clean-css/issues/46) - preserving special characters in URLs and attributes.
+* Fixed issue [#80](https://github.com/clean-css/clean-css/issues/80) - quotation in multi line strings.
+* Fixed issue [#83](https://github.com/clean-css/clean-css/issues/83) - HSL to hex color conversions.
+* Fixed issue [#86](https://github.com/clean-css/clean-css/issues/86) - broken `@charset` replacing.
+* Fixed issue [#88](https://github.com/clean-css/clean-css/issues/88) - removes space in `! important`.
+* Fixed issue [#92](https://github.com/clean-css/clean-css/issues/92) - uppercase hex to short versions.
+
+0.10.2 / 2013-03-19
+===================
+
+* Fixed issue [#79](https://github.com/clean-css/clean-css/issues/79) - node.js 0.10.x compatibility.
+
+0.10.1 / 2013-02-14
+===================
+
+* Fixed issue [#66](https://github.com/clean-css/clean-css/issues/66) - line breaks without extra spaces should
+  be handled correctly.
+
+0.10.0 / 2013-02-09
+===================
+
+* Switched from [optimist](https://github.com/substack/node-optimist) to
+  [commander](https://github.com/visionmedia/commander.js) for CLI processing.
+* Changed long options from `--removeempty` to `--remove-empty` and from `--keeplinebreaks` to `--keep-line-breaks`.
+* Fixed performance issue with replacing multiple `@charset` declarations and issue
+  with line break after `@charset` when using `keepLineBreaks` option. By [@rrjaime](https://github.com/rrjamie).
+* Removed Makefile in favor to `npm run` commands (e.g. `make check` -> `npm run check`).
+* Fixed issue [#47](https://github.com/clean-css/clean-css/issues/47) - commandline issues on Windows.
+* Fixed issue [#49](https://github.com/clean-css/clean-css/issues/49) - remove empty selectors from media query.
+* Fixed issue [#52](https://github.com/clean-css/clean-css/issues/52) - strip fraction zeros if not needed.
+* Fixed issue [#58](https://github.com/clean-css/clean-css/issues/58) - remove colon where possible.
+* Fixed issue [#59](https://github.com/clean-css/clean-css/issues/59) - content property handling.
+
+0.9.1 / 2012-12-19
+==================
+
+* Fixed issue [#37](https://github.com/clean-css/clean-css/issues/37) - converting
+  `white` and other colors in class names (reported by [@malgorithms](https://github.com/malgorithms)).
+
+0.9.0 / 2012-12-15
+==================
+
+* Added stripping quotation from font names (if possible).
+* Added stripping quotation from `@keyframes` declaration, `animation` and
+  `animation-name` property.
+* Added stripping quotations from attributes' value (e.g. `[data-target='x']`).
+* Added better hex->name and name->hex color shortening.
+* Added `font: normal` and `font: bold` shortening the same way as `font-weight` is.
+* Refactored shorthand selectors and added `border-radius`, `border-style`
+  and `border-color` shortening.
+* Added `margin`, `padding` and `border-width` shortening.
+* Added removing line break after commas.
+* Fixed removing whitespace inside media query definition.
+* Added removing line breaks after a comma, so all declarations are one-liners now.
+* Speed optimizations (~10% despite many new features).
+* Added [JSHint](https://github.com/jshint/jshint/) validation rules via `make check`.
+
+0.8.3 / 2012-11-29
+==================
+
+* Fixed HSL/HSLA colors processing.
+
+0.8.2 / 2012-10-31
+==================
+
+* Fixed shortening hex colors and their relation to hashes in URLs.
+* Cleanup by [@XhmikosR](https://github.com/XhmikosR).
+
+0.8.1 / 2012-10-28
+==================
+
+* Added better zeros processing for `rect(...)` syntax (clip property).
+
+0.8.0 / 2012-10-21
+==================
+
+* Added removing URLs quotation if possible.
+* Rewrote breaks processing.
+* Added `keepBreaks`/`-b` option to keep line breaks in the minimized file.
+* Reformatted [lib/clean.js](/lib/clean.js) so it's easier to follow the rules.
+* Minimized test data is now minimized with line breaks so it's easier to
+  compare the changes line by line.
+
+0.7.0 / 2012-10-14
+==================
+
+* Added stripping special comments to CLI (`--s0` and `--s1` options).
+* Added stripping special comments to programmatic interface
+  (`keepSpecialComments` option).
+
+0.6.0 / 2012-08-05
+==================
+
+* Full Windows support with tests (./test.bat).
+
+0.5.0 / 2012-08-02
+==================
+
+* Made path to vows local.
+* Explicit node.js 0.6 requirement.
+
+0.4.2 / 2012-06-28
+==================
+
+* Updated binary `-v` option (version).
+* Updated binary to output help when no options given (but not in piped mode).
+* Added binary tests.
+
+0.4.1 / 2012-06-10
+==================
+
+* Fixed stateless mode where calling `CleanCSS#process` directly was giving
+  errors (reported by [@facelessuser](https://github.com/facelessuser)).
+
+0.4.0 / 2012-06-04
+==================
+
+* Speed improvements up to 4x thanks to the rewrite of comments and CSS' content
+  processing.
+* Stripping empty CSS tags is now optional (see [bin/cleancss](/bin/cleancss) for details).
+* Improved debugging mode (see [test/bench.js](/test/bench.js))
+* Added `make bench` for a one-pass benchmark.
+
+0.3.3 / 2012-05-27
+==================
+
+* Fixed tests, [package.json](/package.json) for development, and regex
+  for removing empty declarations (thanks to [@vvo](https://github.com/vvo)).
+
+0.3.2 / 2012-01-17
+==================
+
+* Fixed output method under node.js 0.6 which incorrectly tried to close
+  `process.stdout`.
+
+0.3.1 / 2011-12-16
+==================
+
+* Fixed cleaning up `0 0 0 0` expressions.
+
+0.3.0 / 2011-11-29
+==================
+
+* Clean-css requires node.js 0.4.0+ to run.
+* Removed node.js's 0.2.x 'sys' package dependency
+  (thanks to [@jmalonzo](https://github.com/jmalonzo) for a patch).
+
+0.2.6 / 2011-11-27
+==================
+
+* Fixed expanding `+` signs in `calc()` when mixed up with adjacent `+` selector.
+
+0.2.5 / 2011-11-27
+==================
+
+* Fixed issue with cleaning up spaces inside `calc`/`-moz-calc` declarations
+  (thanks to [@cvan](https://github.com/cvan) for reporting it).
+* Fixed converting `#f00` to `red` in borders and gradients.
+
+0.2.4 / 2011-05-25
+==================
+
+* Fixed problem with expanding `none` to `0` in partial/full background
+  declarations.
+* Fixed including clean-css library from binary (global to local).
+
+0.2.3 / 2011-04-18
+==================
+
+* Fixed problem with optimizing IE filters.
+
+0.2.2 / 2011-04-17
+==================
+
+* Fixed problem with space before color in `border` property.
+
+0.2.1 / 2011-03-19
+==================
+
+* Added stripping space before `!important` keyword.
+* Updated repository location and author information in [package.json](/package.json).
+
+0.2.0 / 2011-03-02
+==================
+
+* Added options parsing via optimist.
+* Changed code inclusion (thus the version bump).
+
+0.1.0 / 2011-02-27
+==================
+
+* First version of clean-css library.
+* Implemented all basic CSS transformations.
Index: imaps-frontend/node_modules/clean-css/LICENSE
===================================================================
--- imaps-frontend/node_modules/clean-css/LICENSE	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/LICENSE	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,19 @@
+Copyright (C) 2017 JakubPawlowicz.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
Index: imaps-frontend/node_modules/clean-css/README.md
===================================================================
--- imaps-frontend/node_modules/clean-css/README.md	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/README.md	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,987 @@
+<h1 align="center">
+  <br/>
+  <img src="./logo.v2.svg" alt="clean-css logo" width="525px"/>
+  <br/>
+  <br/>
+</h1>
+
+[![npm version](https://img.shields.io/npm/v/clean-css.svg?style=flat)](https://www.npmjs.com/package/clean-css)
+[![Build Status](https://img.shields.io/github/workflow/status/clean-css/clean-css/Tests/master)](https://github.com/clean-css/clean-css/actions?query=workflow%3ATests+branch%3Amaster)
+[![PPC Linux Build Status](https://img.shields.io/travis/clean-css/clean-css/master.svg?style=flat&label=PPC%20Linux%20build)](https://travis-ci.org/clean-css/clean-css)
+[![Dependency Status](https://img.shields.io/david/clean-css/clean-css.svg?style=flat)](https://david-dm.org/clean-css/clean-css)
+[![npm Downloads](https://img.shields.io/npm/dm/clean-css.svg)](https://npmcharts.com/compare/clean-css?minimal=true)
+
+clean-css is a fast and efficient CSS optimizer for [Node.js](http://nodejs.org/) platform and [any modern browser](https://clean-css.github.io/).
+
+According to [tests](http://goalsmashers.github.io/css-minification-benchmark/) it is one of the best available.
+
+**Table of Contents**
+
+- [Node.js version support](#nodejs-version-support)
+- [Install](#install)
+- [Use](#use)
+  * [What's new in version 5.3](#whats-new-in-version-53)
+  * [What's new in version 5.0](#whats-new-in-version-50)
+  * [What's new in version 4.2](#whats-new-in-version-42)
+  * [What's new in version 4.1](#whats-new-in-version-41)
+  * [Important: 4.0 breaking changes](#important-40-breaking-changes)
+  * [Constructor options](#constructor-options)
+  * [Compatibility modes](#compatibility-modes)
+  * [Fetch option](#fetch-option)
+  * [Formatting options](#formatting-options)
+  * [Inlining options](#inlining-options)
+  * [Optimization levels](#optimization-levels)
+    + [Level 0 optimizations](#level-0-optimizations)
+    + [Level 1 optimizations](#level-1-optimizations)
+    + [Level 2 optimizations](#level-2-optimizations)
+  * [Plugins](#plugins)
+  * [Minify method](#minify-method)
+  * [Promise interface](#promise-interface)
+  * [CLI utility](#cli-utility)
+- [FAQ](#faq)
+  * [How to optimize multiple files?](#how-to-optimize-multiple-files)
+  * [How to process multiple files without concatenating them into one output file?](#how-to-process-multiple-files-without-concatenating-them-into-one-output-file)
+  * [How to process remote `@import`s correctly?](#how-to-process-remote-imports-correctly)
+  * [How to apply arbitrary transformations to CSS properties?](#how-to-apply-arbitrary-transformations-to-css-properties)
+  * [How to specify a custom rounding precision?](#how-to-specify-a-custom-rounding-precision)
+  * [How to keep a CSS fragment intact?](#how-to-keep-a-css-fragment-intact)
+  * [How to preserve a comment block?](#how-to-preserve-a-comment-block)
+  * [How to rebase relative image URLs?](#how-to-rebase-relative-image-urls)
+  * [How to work with source maps?](#how-to-work-with-source-maps)
+  * [How to apply level 1 & 2 optimizations at the same time?](#how-to-apply-level-1--2-optimizations-at-the-same-time)
+  * [What level 2 optimizations do?](#what-level-2-optimizations-do)
+  * [What errors and warnings are?](#what-errors-and-warnings-are)
+  * [How to use clean-css with build tools?](#how-to-use-clean-css-with-build-tools)
+  * [How to use clean-css from web browser?](#how-to-use-clean-css-from-web-browser)
+- [Contributing](#contributing)
+  * [How to get started?](#how-to-get-started)
+- [Acknowledgments](#acknowledgments)
+- [License](#license)
+
+# Node.js version support
+
+clean-css requires Node.js 10.0+ (tested on Linux, OS X, and Windows)
+
+# Install
+
+```
+npm install --save-dev clean-css
+```
+
+# Use
+
+```js
+var CleanCSS = require('clean-css');
+var input = 'a{font-weight:bold;}';
+var options = { /* options */ };
+var output = new CleanCSS(options).minify(input);
+```
+
+## What's new in version 5.3
+
+clean-css 5.3 introduces one new feature:
+
+* variables can be optimized using level 1's `variableValueOptimizers` option, which accepts a list of [value optimizers](https://github.com/clean-css/clean-css/blob/master/lib/optimizer/level-1/value-optimizers.js) or a list of their names, e.g. `variableValueOptimizers: ['color', 'fraction']`.
+
+## What's new in version 5.0
+
+clean-css 5.0 introduced some breaking changes:
+
+* Node.js 6.x and 8.x are officially no longer supported;
+* `transform` callback in level-1 optimizations is removed in favor of new [plugins](#plugins) interface;
+* changes default Internet Explorer compatibility from 10+ to >11, to revert the old default use `{ compatibility: 'ie10' }` flag;
+* changes default `rebase` option from `true` to `false` so URLs are not rebased by default. Please note that if you set `rebaseTo` option it still counts as setting `rebase: true` to preserve some of the backward compatibility.
+
+And on the new features side of things:
+
+* format options now accepts numerical values for all breaks, which will allow you to have more control over output formatting, e.g. `format: {breaks: {afterComment: 2}}` means clean-css will add two line breaks after each comment
+* a new `batch` option (defaults to `false`) is added, when set to `true` it will process all inputs, given either as an array or a hash, without concatenating them.
+
+## What's new in version 4.2
+
+clean-css 4.2 introduces the following changes / features:
+
+* Adds `process` method for compatibility with optimize-css-assets-webpack-plugin;
+* new `transition` property optimizer;
+* preserves any CSS content between `/* clean-css ignore:start */` and `/* clean-css ignore:end */` comments;
+* allows filtering based on selector in `transform` callback, see [example](#how-to-apply-arbitrary-transformations-to-css-properties);
+* adds configurable line breaks via `format: { breakWith: 'lf' }` option.
+
+## What's new in version 4.1
+
+clean-css 4.1 introduces the following changes / features:
+
+* `inline: false` as an alias to `inline: ['none']`;
+* `multiplePseudoMerging` compatibility flag controlling merging of rules with multiple pseudo classes / elements;
+* `removeEmpty` flag in level 1 optimizations controlling removal of rules and nested blocks;
+* `removeEmpty` flag in level 2 optimizations controlling removal of rules and nested blocks;
+* `compatibility: { selectors: { mergeLimit: <number> } }` flag in compatibility settings controlling maximum number of selectors in a single rule;
+* `minify` method improved signature accepting a list of hashes for a predictable traversal;
+* `selectorsSortingMethod` level 1 optimization allows `false` or `'none'` for disabling selector sorting;
+* `fetch` option controlling a function for handling remote requests;
+* new `font` shorthand and `font-*` longhand optimizers;
+* removal of `optimizeFont` flag in level 1 optimizations due to new `font` shorthand optimizer;
+* `skipProperties` flag in level 2 optimizations controlling which properties won't be optimized;
+* new `animation` shorthand and `animation-*` longhand optimizers;
+* `removeUnusedAtRules` level 2 optimization controlling removal of unused `@counter-style`, `@font-face`, `@keyframes`, and `@namespace` at rules;
+* the [web interface](https://clean-css.github.io/) gets an improved settings panel with "reset to defaults", instant option changes, and settings being persisted across sessions.
+
+## Important: 4.0 breaking changes
+
+clean-css 4.0 introduces some breaking changes:
+
+* API and CLI interfaces are split, so API stays in this repository while CLI moves to [clean-css-cli](https://github.com/clean-css/clean-css-cli);
+* `root`, `relativeTo`, and `target` options are replaced by a single `rebaseTo` option - this means that rebasing URLs and import inlining is much simpler but may not be (YMMV) as powerful as in 3.x;
+* `debug` option is gone as stats are always provided in output object under `stats` property;
+* `roundingPrecision` is disabled by default;
+* `roundingPrecision` applies to **all** units now, not only `px` as in 3.x;
+* `processImport` and `processImportFrom` are merged into `inline` option which defaults to `local`. Remote `@import` rules are **NOT** inlined by default anymore;
+* splits `inliner: { request: ..., timeout: ... }` option into `inlineRequest` and `inlineTimeout` options;
+* remote resources without a protocol, e.g. `//fonts.googleapis.com/css?family=Domine:700`, are not inlined anymore;
+* changes default Internet Explorer compatibility from 9+ to 10+, to revert the old default use `{ compatibility: 'ie9' }` flag;
+* renames `keepSpecialComments` to `specialComments`;
+* moves `roundingPrecision` and `specialComments` to level 1 optimizations options, see examples;
+* moves `mediaMerging`, `restructuring`, `semanticMerging`, and `shorthandCompacting` to level 2 optimizations options, see examples below;
+* renames `shorthandCompacting` option to `mergeIntoShorthands`;
+* level 1 optimizations are the new default, up to 3.x it was level 2;
+* `keepBreaks` option is replaced with `{ format: 'keep-breaks' }` to ease transition;
+* `sourceMap` option has to be a boolean from now on - to specify an input source map pass it a 2nd argument to `minify` method or via a hash instead;
+* `aggressiveMerging` option is removed as aggressive merging is replaced by smarter override merging.
+
+## Constructor options
+
+clean-css constructor accepts a hash as a parameter with the following options available:
+
+* `compatibility` - controls compatibility mode used; defaults to `ie10+`; see [compatibility modes](#compatibility-modes) for examples;
+* `fetch` - controls a function for handling remote requests; see [fetch option](#fetch-option) for examples (since 4.1.0);
+* `format` - controls output CSS formatting; defaults to `false`; see [formatting options](#formatting-options) for examples;
+* `inline` - controls `@import` inlining rules; defaults to `'local'`; see [inlining options](#inlining-options) for examples;
+* `inlineRequest` - controls extra options for inlining remote `@import` rules, can be any of [HTTP(S) request options](https://nodejs.org/api/http.html#http_http_request_options_callback);
+* `inlineTimeout` - controls number of milliseconds after which inlining a remote `@import` fails; defaults to 5000;
+* `level` - controls optimization level used; defaults to `1`; see [optimization levels](#optimization-levels) for examples;
+* `rebase` - controls URL rebasing; defaults to `false`;
+* `rebaseTo` - controls a directory to which all URLs are rebased, most likely the directory under which the output file will live; defaults to the current directory;
+* `returnPromise` - controls whether `minify` method returns a Promise object or not; defaults to `false`; see [promise interface](#promise-interface) for examples;
+* `sourceMap` - controls whether an output source map is built; defaults to `false`;
+* `sourceMapInlineSources` - controls embedding sources inside a source map's `sourcesContent` field; defaults to false.
+
+## Compatibility modes
+
+There is a certain number of compatibility mode shortcuts, namely:
+
+* `new CleanCSS({ compatibility: '*' })` (default) - Internet Explorer 10+ compatibility mode
+* `new CleanCSS({ compatibility: 'ie9' })` - Internet Explorer 9+ compatibility mode
+* `new CleanCSS({ compatibility: 'ie8' })` - Internet Explorer 8+ compatibility mode
+* `new CleanCSS({ compatibility: 'ie7' })` - Internet Explorer 7+ compatibility mode
+
+Each of these modes is an alias to a [fine grained configuration](https://github.com/clean-css/clean-css/blob/master/lib/options/compatibility.js), with the following options available:
+
+```js
+new CleanCSS({
+  compatibility: {
+    colors: {
+      hexAlpha: false, // controls 4- and 8-character hex color support
+      opacity: true // controls `rgba()` / `hsla()` color support
+    },
+    properties: {
+      backgroundClipMerging: true, // controls background-clip merging into shorthand
+      backgroundOriginMerging: true, // controls background-origin merging into shorthand
+      backgroundSizeMerging: true, // controls background-size merging into shorthand
+      colors: true, // controls color optimizations
+      ieBangHack: false, // controls keeping IE bang hack
+      ieFilters: false, // controls keeping IE `filter` / `-ms-filter`
+      iePrefixHack: false, // controls keeping IE prefix hack
+      ieSuffixHack: false, // controls keeping IE suffix hack
+      merging: true, // controls property merging based on understandability
+      shorterLengthUnits: false, // controls shortening pixel units into `pc`, `pt`, or `in` units
+      spaceAfterClosingBrace: true, // controls keeping space after closing brace - `url() no-repeat` into `url()no-repeat`
+      urlQuotes: true, // controls keeping quoting inside `url()`
+      zeroUnits: true // controls removal of units `0` value
+    },
+    selectors: {
+      adjacentSpace: false, // controls extra space before `nav` element
+      ie7Hack: true, // controls removal of IE7 selector hacks, e.g. `*+html...`
+      mergeablePseudoClasses: [':active', ...], // controls a whitelist of mergeable pseudo classes
+      mergeablePseudoElements: ['::after', ...], // controls a whitelist of mergeable pseudo elements
+      mergeLimit: 8191, // controls maximum number of selectors in a single rule (since 4.1.0)
+      multiplePseudoMerging: true // controls merging of rules with multiple pseudo classes / elements (since 4.1.0)
+    },
+    units: {
+      ch: true, // controls treating `ch` as a supported unit
+      in: true, // controls treating `in` as a supported unit
+      pc: true, // controls treating `pc` as a supported unit
+      pt: true, // controls treating `pt` as a supported unit
+      rem: true, // controls treating `rem` as a supported unit
+      vh: true, // controls treating `vh` as a supported unit
+      vm: true, // controls treating `vm` as a supported unit
+      vmax: true, // controls treating `vmax` as a supported unit
+      vmin: true // controls treating `vmin` as a supported unit
+    }
+  }
+})
+```
+
+You can also use a string when setting a compatibility mode, e.g.
+
+```js
+new CleanCSS({
+  compatibility: 'ie9,-properties.merging' // sets compatibility to IE9 mode with disabled property merging
+})
+```
+
+## Fetch option
+
+The `fetch` option accepts a function which handles remote resource fetching, e.g.
+
+```js
+var request = require('request');
+var source = '@import url(http://example.com/path/to/stylesheet.css);';
+new CleanCSS({
+  fetch: function (uri, inlineRequest, inlineTimeout, callback) {
+    request(uri, function (error, response, body) {
+      if (error) {
+        callback(error, null);
+      } else if (response && response.statusCode != 200) {
+        callback(response.statusCode, null);
+      } else {
+        callback(null, body);
+      }
+    });
+  }
+}).minify(source);
+```
+
+This option provides a convenient way of overriding the default fetching logic if it doesn't support a particular feature, say CONNECT proxies.
+
+Unless given, the default [loadRemoteResource](https://github.com/clean-css/clean-css/blob/master/lib/reader/load-remote-resource.js) logic is used.
+
+## Formatting options
+
+By default output CSS is formatted without any whitespace unless a `format` option is given.
+First of all there are two shorthands:
+
+```js
+new CleanCSS({
+  format: 'beautify' // formats output in a really nice way
+})
+```
+
+and
+
+```js
+new CleanCSS({
+  format: 'keep-breaks' // formats output the default way but adds line breaks for improved readability
+})
+```
+
+however `format` option also accept a fine-grained set of options:
+
+```js
+new CleanCSS({
+  format: {
+    breaks: { // controls where to insert breaks
+      afterAtRule: false, // controls if a line break comes after an at-rule; e.g. `@charset`; defaults to `false`
+      afterBlockBegins: false, // controls if a line break comes after a block begins; e.g. `@media`; defaults to `false`
+      afterBlockEnds: false, // controls if a line break comes after a block ends, defaults to `false`
+      afterComment: false, // controls if a line break comes after a comment; defaults to `false`
+      afterProperty: false, // controls if a line break comes after a property; defaults to `false`
+      afterRuleBegins: false, // controls if a line break comes after a rule begins; defaults to `false`
+      afterRuleEnds: false, // controls if a line break comes after a rule ends; defaults to `false`
+      beforeBlockEnds: false, // controls if a line break comes before a block ends; defaults to `false`
+      betweenSelectors: false // controls if a line break comes between selectors; defaults to `false`
+    },
+    breakWith: '\n', // controls the new line character, can be `'\r\n'` or `'\n'` (aliased as `'windows'` and `'unix'` or `'crlf'` and `'lf'`); defaults to system one, so former on Windows and latter on Unix
+    indentBy: 0, // controls number of characters to indent with; defaults to `0`
+    indentWith: 'space', // controls a character to indent with, can be `'space'` or `'tab'`; defaults to `'space'`
+    spaces: { // controls where to insert spaces
+      aroundSelectorRelation: false, // controls if spaces come around selector relations; e.g. `div > a`; defaults to `false`
+      beforeBlockBegins: false, // controls if a space comes before a block begins; e.g. `.block {`; defaults to `false`
+      beforeValue: false // controls if a space comes before a value; e.g. `width: 1rem`; defaults to `false`
+    },
+    wrapAt: false, // controls maximum line length; defaults to `false`
+    semicolonAfterLastProperty: false // controls removing trailing semicolons in rule; defaults to `false` - means remove
+  }
+})
+```
+
+Also since clean-css 5.0 you can use numerical values for all line breaks, which will repeat a line break that many times, e.g:
+
+```js
+  new CleanCSS({
+    format: {
+      breaks: {
+        afterAtRule: 2,
+        afterBlockBegins: 1, // 1 is synonymous with `true`
+        afterBlockEnds: 2,
+        afterComment: 1,
+        afterProperty: 1,
+        afterRuleBegins: 1,
+        afterRuleEnds: 1,
+        beforeBlockEnds: 1,
+        betweenSelectors: 0 // 0 is synonymous with `false`
+      }
+    }
+  })
+```
+
+which will add nicer spacing between at rules and blocks.
+
+## Inlining options
+
+`inline` option whitelists which `@import` rules will be processed, e.g.
+
+```js
+new CleanCSS({
+  inline: ['local'] // default; enables local inlining only
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['none'] // disables all inlining
+})
+```
+
+```js
+// introduced in clean-css 4.1.0
+
+new CleanCSS({
+  inline: false // disables all inlining (alias to `['none']`)
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['all'] // enables all inlining, same as ['local', 'remote']
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['local', 'mydomain.example.com'] // enables local inlining plus given remote source
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['local', 'remote', '!fonts.googleapis.com'] // enables all inlining but from given remote source
+})
+```
+
+## Optimization levels
+
+The `level` option can be either `0`, `1` (default), or `2`, e.g.
+
+```js
+new CleanCSS({
+  level: 2
+})
+```
+
+or a fine-grained configuration given via a hash.
+
+Please note that level 1 optimization options are generally safe while level 2 optimizations should be safe for most users.
+
+### Level 0 optimizations
+
+Level 0 optimizations simply means "no optimizations". Use it when you'd like to inline imports and / or rebase URLs but skip everything else.
+
+### Level 1 optimizations
+
+Level 1 optimizations (default) operate on single properties only, e.g. can remove units when not required, turn rgb colors to a shorter hex representation, remove comments, etc
+
+Here is a full list of available options:
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      cleanupCharsets: true, // controls `@charset` moving to the front of a stylesheet; defaults to `true`
+      normalizeUrls: true, // controls URL normalization; defaults to `true`
+      optimizeBackground: true, // controls `background` property optimizations; defaults to `true`
+      optimizeBorderRadius: true, // controls `border-radius` property optimizations; defaults to `true`
+      optimizeFilter: true, // controls `filter` property optimizations; defaults to `true`
+      optimizeFont: true, // controls `font` property optimizations; defaults to `true`
+      optimizeFontWeight: true, // controls `font-weight` property optimizations; defaults to `true`
+      optimizeOutline: true, // controls `outline` property optimizations; defaults to `true`
+      removeEmpty: true, // controls removing empty rules and nested blocks; defaults to `true`
+      removeNegativePaddings: true, // controls removing negative paddings; defaults to `true`
+      removeQuotes: true, // controls removing quotes when unnecessary; defaults to `true`
+      removeWhitespace: true, // controls removing unused whitespace; defaults to `true`
+      replaceMultipleZeros: true, // contols removing redundant zeros; defaults to `true`
+      replaceTimeUnits: true, // controls replacing time units with shorter values; defaults to `true`
+      replaceZeroUnits: true, // controls replacing zero values with units; defaults to `true`
+      roundingPrecision: false, // rounds pixel values to `N` decimal places; `false` disables rounding; defaults to `false`
+      selectorsSortingMethod: 'standard', // denotes selector sorting method; can be `'natural'` or `'standard'`, `'none'`, or false (the last two since 4.1.0); defaults to `'standard'`
+      specialComments: 'all', // denotes a number of /*! ... */ comments preserved; defaults to `all`
+      tidyAtRules: true, // controls at-rules (e.g. `@charset`, `@import`) optimizing; defaults to `true`
+      tidyBlockScopes: true, // controls block scopes (e.g. `@media`) optimizing; defaults to `true`
+      tidySelectors: true, // controls selectors optimizing; defaults to `true`,
+      variableValueOptimizers: [] // controls value optimizers which are applied to variables
+    }
+  }
+});
+```
+
+There is an `all` shortcut for toggling all options at the same time, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      all: false, // set all values to `false`
+      tidySelectors: true // turns on optimizing selectors
+    }
+  }
+});
+```
+
+### Level 2 optimizations
+
+Level 2 optimizations operate at rules or multiple properties level, e.g. can remove duplicate rules, remove properties redefined further down a stylesheet, or restructure rules by moving them around.
+
+Please note that if level 2 optimizations are turned on then, unless explicitely disabled, level 1 optimizations are applied as well.
+
+Here is a full list of available options:
+
+```js
+new CleanCSS({
+  level: {
+    2: {
+      mergeAdjacentRules: true, // controls adjacent rules merging; defaults to true
+      mergeIntoShorthands: true, // controls merging properties into shorthands; defaults to true
+      mergeMedia: true, // controls `@media` merging; defaults to true
+      mergeNonAdjacentRules: true, // controls non-adjacent rule merging; defaults to true
+      mergeSemantically: false, // controls semantic merging; defaults to false
+      overrideProperties: true, // controls property overriding based on understandability; defaults to true
+      removeEmpty: true, // controls removing empty rules and nested blocks; defaults to `true`
+      reduceNonAdjacentRules: true, // controls non-adjacent rule reducing; defaults to true
+      removeDuplicateFontRules: true, // controls duplicate `@font-face` removing; defaults to true
+      removeDuplicateMediaBlocks: true, // controls duplicate `@media` removing; defaults to true
+      removeDuplicateRules: true, // controls duplicate rules removing; defaults to true
+      removeUnusedAtRules: false, // controls unused at rule removing; defaults to false (available since 4.1.0)
+      restructureRules: false, // controls rule restructuring; defaults to false
+      skipProperties: [] // controls which properties won't be optimized, defaults to `[]` which means all will be optimized (since 4.1.0)
+    }
+  }
+});
+```
+
+There is an `all` shortcut for toggling all options at the same time, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    2: {
+      all: false, // sets all values to `false`
+      removeDuplicateRules: true // turns on removing duplicate rules
+    }
+  }
+});
+```
+
+## Plugins
+
+In clean-css version 5 and above you can define plugins which run alongside level 1 and level 2 optimizations, e.g.
+
+```js
+var myPlugin = {
+  level1: {
+    property: function removeRepeatedBackgroundRepeat(_rule, property, _options) {
+      // So `background-repeat:no-repeat no-repeat` becomes `background-repeat:no-repeat`
+      if (property.name == 'background-repeat' && property.value.length == 2 && property.value[0][1] == property.value[1][1]) {
+        property.value.pop();
+        property.dirty = true;
+      }
+    }
+  }
+}
+
+new CleanCSS({plugins: [myPlugin]})
+
+```
+
+Search `test\module-test.js` for `plugins` or check out `lib/optimizer/level-1/property-optimizers` and `lib/optimizer/level-1/value-optimizers` for more examples.
+
+__Important__: To rewrite your old `transform` as a plugin, check out [this commit](https://github.com/clean-css/clean-css/commit/b6ddc523267fc42cf0f6bd1626a79cad97319e17#diff-a71ef45f934725cdb25860dc0b606bcd59e3acee9788cd6df4f9d05339e8a153).
+
+## Minify method
+
+Once configured clean-css provides a `minify` method to optimize a given CSS, e.g.
+
+```js
+var output = new CleanCSS(options).minify(source);
+```
+
+The output of the `minify` method is a hash with following fields:
+
+```js
+console.log(output.styles); // optimized output CSS as a string
+console.log(output.sourceMap); // output source map if requested with `sourceMap` option
+console.log(output.errors); // a list of errors raised
+console.log(output.warnings); // a list of warnings raised
+console.log(output.stats.originalSize); // original content size after import inlining
+console.log(output.stats.minifiedSize); // optimized content size
+console.log(output.stats.timeSpent); // time spent on optimizations in milliseconds
+console.log(output.stats.efficiency); // `(originalSize - minifiedSize) / originalSize`, e.g. 0.25 if size is reduced from 100 bytes to 75 bytes
+```
+Example: Minifying a CSS string:
+
+```js
+const CleanCSS = require("clean-css");
+
+const output = new CleanCSS().minify(`
+
+  a {
+    color: blue;
+  }
+  div {
+    margin: 5px
+  }
+
+`);
+
+console.log(output);
+
+// Log:
+{
+  styles: 'a{color:#00f}div{margin:5px}',
+  stats: {
+    efficiency: 0.6704545454545454,
+    minifiedSize: 29,
+    originalSize: 88,
+    timeSpent: 6
+  },
+  errors: [],
+  inlinedStylesheets: [],
+  warnings: []
+}
+```
+
+The `minify` method also accepts an input source map, e.g.
+
+```js
+var output = new CleanCSS(options).minify(source, inputSourceMap);
+```
+
+or a callback invoked when optimizations are finished, e.g.
+
+```js
+new CleanCSS(options).minify(source, function (error, output) {
+  // `output` is the same as in the synchronous call above
+});
+```
+
+To optimize a single file, without reading it first, pass a path to it to `minify` method as follows:
+
+```js
+var output = new CleanCSS(options).minify(['path/to/file.css'])
+```
+
+(if you won't enclose the path in an array, it will be treated as a CSS source instead).
+
+There are several ways to optimize multiple files at the same time, see [How to optimize multiple files?](#how-to-optimize-multiple-files).
+
+## Promise interface
+
+If you prefer clean-css to return a Promise object then you need to explicitely ask for it, e.g.
+
+```js
+new CleanCSS({ returnPromise: true })
+  .minify(source)
+  .then(function (output) { console.log(output.styles); })
+  .catch(function (error) { // deal with errors });
+```
+
+## CLI utility
+
+Clean-css has an associated command line utility that can be installed separately using `npm install clean-css-cli`. For more detailed information, please visit https://github.com/clean-css/clean-css-cli.
+
+# FAQ
+
+## How to optimize multiple files?
+
+It can be done either by passing an array of paths, or, when sources are already available, a hash or an array of hashes:
+
+```js
+new CleanCSS().minify(['path/to/file/one', 'path/to/file/two']);
+```
+
+```js
+new CleanCSS().minify({
+  'path/to/file/one': {
+    styles: 'contents of file one'
+  },
+  'path/to/file/two': {
+    styles: 'contents of file two'
+  }
+});
+```
+
+```js
+new CleanCSS().minify([
+  {'path/to/file/one': {styles: 'contents of file one'}},
+  {'path/to/file/two': {styles: 'contents of file two'}}
+]);
+```
+
+Passing an array of hashes allows you to explicitly specify the order in which the input files are concatenated. Whereas when you use a single hash the order is determined by the [traversal order of object properties](http://2ality.com/2015/10/property-traversal-order-es6.html) - available since 4.1.0.
+
+Important note - any `@import` rules already present in the hash will be resolved in memory.
+
+## How to process multiple files without concatenating them into one output file?
+
+Since clean-css 5.0 you can, when passing an array of paths, hash, or array of hashes (see above), ask clean-css not to join styles into one output, but instead return stylesheets optimized one by one, e.g.
+
+```js
+var output = new CleanCSS({ batch: true }).minify(['path/to/file/one', 'path/to/file/two']);
+var outputOfFile1 = output['path/to/file/one'].styles // all other fields, like errors, warnings, or stats are there too
+var outputOfFile2 = output['path/to/file/two'].styles
+```
+
+## How to process remote `@import`s correctly?
+
+In order to inline remote `@import` statements you need to provide a callback to minify method as fetching remote assets is an asynchronous operation, e.g.:
+
+```js
+var source = '@import url(http://example.com/path/to/remote/styles);';
+new CleanCSS({ inline: ['remote'] }).minify(source, function (error, output) {
+  // output.styles
+});
+```
+
+If you don't provide a callback, then remote `@import`s will be left as is.
+
+## How to apply arbitrary transformations to CSS properties?
+
+Please see [plugins](#plugins).
+
+## How to specify a custom rounding precision?
+
+The level 1 `roundingPrecision` optimization option accept a string with per-unit rounding precision settings, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      roundingPrecision: 'all=3,px=5'
+    }
+  }
+}).minify(source)
+```
+
+which sets all units rounding precision to 3 digits except `px` unit precision of 5 digits.
+
+## How to optimize a stylesheet with custom `rpx` units?
+
+Since `rpx` is a non standard unit (see [#1074](https://github.com/clean-css/clean-css/issues/1074)), it will be dropped by default as an invalid value.
+
+However you can treat `rpx` units as regular ones:
+
+```js
+new CleanCSS({
+  compatibility: {
+    customUnits: {
+      rpx: true
+    }
+  }
+}).minify(source)
+```
+
+## How to keep a CSS fragment intact?
+
+Note: available since 4.2.0.
+
+Wrap the CSS fragment in special comments which instruct clean-css to preserve it, e.g.
+
+```css
+.block-1 {
+  color: red
+}
+/* clean-css ignore:start */
+.block-special {
+  color: transparent
+}
+/* clean-css ignore:end */
+.block-2 {
+  margin: 0
+}
+```
+
+Optimizing this CSS will result in the following output:
+
+```css
+.block-1{color:red}
+.block-special {
+  color: transparent
+}
+.block-2{margin:0}
+```
+
+## How to preserve a comment block?
+
+Use the `/*!` notation instead of the standard one `/*`:
+
+```css
+/*!
+  Important comments included in optimized output.
+*/
+```
+
+## How to rebase relative image URLs?
+
+clean-css will handle it automatically for you in the following cases:
+
+* when full paths to input files are passed in as options;
+* when correct paths are passed in via a hash;
+* when `rebaseTo` is used with any of above two.
+
+## How to work with source maps?
+
+To generate a source map, use `sourceMap: true` option, e.g.:
+
+```js
+new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory })
+  .minify(source, function (error, output) {
+    // access output.sourceMap for SourceMapGenerator object
+    // see https://github.com/mozilla/source-map/#sourcemapgenerator for more details
+});
+```
+
+You can also pass an input source map directly as a 2nd argument to `minify` method:
+
+```js
+new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory })
+  .minify(source, inputSourceMap, function (error, output) {
+    // access output.sourceMap to access SourceMapGenerator object
+    // see https://github.com/mozilla/source-map/#sourcemapgenerator for more details
+});
+```
+
+or even multiple input source maps at once:
+
+```js
+new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory }).minify({
+  'path/to/source/1': {
+    styles: '...styles...',
+    sourceMap: '...source-map...'
+  },
+  'path/to/source/2': {
+    styles: '...styles...',
+    sourceMap: '...source-map...'
+  }
+}, function (error, output) {
+  // access output.sourceMap as above
+});
+```
+
+## How to apply level 1 & 2 optimizations at the same time?
+
+Using the hash configuration specifying both optimization levels, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      all: true,
+      normalizeUrls: false
+    },
+    2: {
+      restructureRules: true
+    }
+  }
+})
+```
+
+will apply level 1 optimizations, except url normalization, and default level 2 optimizations with rule restructuring.
+
+## What level 2 optimizations do?
+
+All level 2 optimizations are dispatched [here](https://github.com/clean-css/clean-css/blob/master/lib/optimizer/level-2/optimize.js#L67), and this is what they do:
+
+* `recursivelyOptimizeBlocks` - does all the following operations on a nested block, like `@media` or `@keyframe`;
+* `recursivelyOptimizeProperties` - optimizes properties in rulesets and flat at-rules, like @font-face, by splitting them into components (e.g. `margin` into `margin-(bottom|left|right|top)`), optimizing, and restoring them back. You may want to use `mergeIntoShorthands` option to control whether you want to turn multiple components into shorthands;
+* `removeDuplicates` - gets rid of duplicate rulesets with exactly the same set of properties, e.g. when including a Sass / Less partial twice for no good reason;
+* `mergeAdjacent` - merges adjacent rulesets with the same selector or rules;
+* `reduceNonAdjacent` - identifies which properties are overridden in same-selector non-adjacent rulesets, and removes them;
+* `mergeNonAdjacentBySelector` - identifies same-selector non-adjacent rulesets which can be moved (!) to be merged, requires all intermediate rulesets to not redefine the moved properties, or if redefined to have the same value;
+* `mergeNonAdjacentByBody` - same as the one above but for same-selector non-adjacent rulesets;
+* `restructure` - tries to reorganize different-selector different-rules rulesets so they take less space, e.g. `.one{padding:0}.two{margin:0}.one{margin-bottom:3px}` into `.two{margin:0}.one{padding:0;margin-bottom:3px}`;
+* `removeDuplicateFontAtRules` - removes duplicated `@font-face` rules;
+* `removeDuplicateMediaQueries` - removes duplicated `@media` nested blocks;
+* `mergeMediaQueries` - merges non-adjacent `@media` at-rules by the same rules as `mergeNonAdjacentBy*` above;
+
+## What errors and warnings are?
+
+If clean-css encounters invalid CSS, it will try to remove the invalid part and continue optimizing the rest of the code. It will make you aware of the problem by generating an error or warning. Although clean-css can work with invalid CSS, it is always recommended that you fix warnings and errors in your CSS.
+
+Example: Minify invalid CSS, resulting in two warnings:
+
+```js
+const CleanCSS = require("clean-css");
+
+const output = new CleanCSS().minify(`
+
+  a {
+    -notarealproperty-: 5px;
+    color:
+  }
+  div {
+    margin: 5px
+  }
+
+`);
+
+console.log(output);
+
+// Log:
+{
+  styles: 'div{margin:5px}',
+  stats: {
+    efficiency: 0.8695652173913043,
+    minifiedSize: 15,
+    originalSize: 115,
+    timeSpent: 1
+  },
+  errors: [],
+  inlinedStylesheets: [],
+  warnings: [
+    "Invalid property name '-notarealproperty-' at 4:8. Ignoring.",
+    "Empty property 'color' at 5:8. Ignoring."
+  ]
+}
+```
+
+Example: Minify invalid CSS, resulting in one error:
+
+```js
+const CleanCSS = require("clean-css");
+
+const output = new CleanCSS().minify(`
+
+  @import "idontexist.css";
+  a {
+    color: blue;
+  }
+  div {
+    margin: 5px
+  }
+
+`);
+
+console.log(output);
+
+// Log:
+{
+  styles: 'a{color:#00f}div{margin:5px}',
+  stats: {
+    efficiency: 0.7627118644067796,
+    minifiedSize: 28,
+    originalSize: 118,
+    timeSpent: 2
+  },
+  errors: [
+    'Ignoring local @import of "idontexist.css" as resource is missing.'
+  ],
+  inlinedStylesheets: [],
+  warnings: []
+}
+```
+## Clean-css for Gulp
+An example of how you can include clean-css in gulp
+```js
+const { src, dest, series } = require('gulp');
+const CleanCSS = require('clean-css');
+const concat = require('gulp-concat');
+
+function css() {
+    const options = {
+        compatibility: '*', // (default) - Internet Explorer 10+ compatibility mode
+        inline: ['all'], // enables all inlining, same as ['local', 'remote']
+        level: 2 // Optimization levels. The level option can be either 0, 1 (default), or 2, e.g.
+        // Please note that level 1 optimization options are generally safe while level 2 optimizations should be safe for most users.
+    };
+
+    return src('app/**/*.css')
+        .pipe(concat('style.min.css'))
+        .on('data', function(file) {
+            const buferFile = new CleanCSS(options).minify(file.contents)
+            return file.contents = Buffer.from(buferFile.styles)
+        })
+        .pipe(dest('build'))
+}
+exports.css = series(css)
+```
+
+## How to use clean-css with build tools?
+
+There is a number of 3rd party plugins to popular build tools:
+
+* [Broccoli](https://github.com/broccolijs/broccoli#broccoli): [broccoli-clean-css](https://github.com/shinnn/broccoli-clean-css)
+* [Brunch](http://brunch.io/): [clean-css-brunch](https://github.com/brunch/clean-css-brunch)
+* [Grunt](http://gruntjs.com): [grunt-contrib-cssmin](https://github.com/gruntjs/grunt-contrib-cssmin)
+* [Gulp](http://gulpjs.com/): [gulp-clean-css](https://github.com/scniro/gulp-clean-css)
+* [Gulp](http://gulpjs.com/): [using vinyl-map as a wrapper - courtesy of @sogko](https://github.com/clean-css/clean-css/issues/342)
+* [component-builder2](https://github.com/component/builder2.js): [builder-clean-css](https://github.com/poying/builder-clean-css)
+* [Metalsmith](http://metalsmith.io): [metalsmith-clean-css](https://github.com/aymericbeaumet/metalsmith-clean-css)
+* [Lasso](https://github.com/lasso-js/lasso): [lasso-clean-css](https://github.com/yomed/lasso-clean-css)
+* [Start](https://github.com/start-runner/start): [start-clean-css](https://github.com/start-runner/clean-css)
+
+## How to use clean-css from web browser?
+
+* https://clean-css.github.io/ (official web interface)
+* http://refresh-sf.com/
+* http://adamburgess.github.io/clean-css-online/
+
+# Contributing
+
+See [CONTRIBUTING.md](https://github.com/clean-css/clean-css/blob/master/CONTRIBUTING.md).
+
+## How to get started?
+
+First clone the sources:
+
+```bash
+git clone git@github.com:clean-css/clean-css.git
+```
+
+then install dependencies:
+
+```bash
+cd clean-css
+npm install
+```
+
+then use any of the following commands to verify your copy:
+
+```bash
+npm run bench # for clean-css benchmarks (see [test/bench.js](https://github.com/clean-css/clean-css/blob/master/test/bench.js) for details)
+npm run browserify # to create the browser-ready clean-css version
+npm run check # to lint JS sources with [JSHint](https://github.com/jshint/jshint/)
+npm test # to run all tests
+```
+
+# Acknowledgments
+
+Sorted alphabetically by GitHub handle:
+
+* [@abarre](https://github.com/abarre) (Anthony Barre) for improvements to `@import` processing;
+* [@alexlamsl](https://github.com/alexlamsl) (Alex Lam S.L.) for testing early clean-css 4 versions, reporting bugs, and suggesting numerous improvements.
+* [@altschuler](https://github.com/altschuler) (Simon Altschuler) for fixing `@import` processing inside comments;
+* [@ben-eb](https://github.com/ben-eb) (Ben Briggs) for sharing ideas about CSS optimizations;
+* [@davisjam](https://github.com/davisjam) (Jamie Davis) for disclosing ReDOS vulnerabilities;
+* [@facelessuser](https://github.com/facelessuser) (Isaac) for pointing out a flaw in clean-css' stateless mode;
+* [@grandrath](https://github.com/grandrath) (Martin Grandrath) for improving `minify` method source traversal in ES6;
+* [@jmalonzo](https://github.com/jmalonzo) (Jan Michael Alonzo) for a patch removing node.js' old `sys` package;
+* [@lukeapage](https://github.com/lukeapage) (Luke Page) for suggestions and testing the source maps feature;
+  Plus everyone else involved in [#125](https://github.com/clean-css/clean-css/issues/125) for pushing it forward;
+* [@madwizard-thomas](https://github.com/madwizard-thomas) for sharing ideas about `@import` inlining and URL rebasing.
+* [@ngyikp](https://github.com/ngyikp) (Ng Yik Phang) for testing early clean-css 4 versions, reporting bugs, and suggesting numerous improvements.
+* [@wagenet](https://github.com/wagenet) (Peter Wagenet) for suggesting improvements to `@import` inlining behavior;
+* [@venemo](https://github.com/venemo) (Timur Kristóf) for an outstanding contribution of advanced property optimizer for 2.2 release;
+* [@vvo](https://github.com/vvo) (Vincent Voyer) for a patch with better empty element regex and for inspiring us to do many performance improvements in 0.4 release;
+* [@xhmikosr](https://github.com/xhmikosr) for suggesting new features, like option to remove special comments and strip out URLs quotation, and pointing out numerous improvements like JSHint, media queries, etc.
+
+# License
+
+clean-css is released under the [MIT License](https://github.com/clean-css/clean-css/blob/master/LICENSE).
Index: imaps-frontend/node_modules/clean-css/index.js
===================================================================
--- imaps-frontend/node_modules/clean-css/index.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/index.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,1 @@
+module.exports = require('./lib/clean');
Index: imaps-frontend/node_modules/clean-css/lib/clean.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/clean.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/clean.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,241 @@
+/**
+ * Clean-css - https://github.com/clean-css/clean-css
+ * Released under the terms of MIT license
+ */
+
+var level0Optimize = require('./optimizer/level-0/optimize');
+var level1Optimize = require('./optimizer/level-1/optimize');
+var level2Optimize = require('./optimizer/level-2/optimize');
+var validator = require('./optimizer/validator');
+
+var compatibilityFrom = require('./options/compatibility');
+var fetchFrom = require('./options/fetch');
+var formatFrom = require('./options/format').formatFrom;
+var inlineFrom = require('./options/inline');
+var inlineRequestFrom = require('./options/inline-request');
+var inlineTimeoutFrom = require('./options/inline-timeout');
+var OptimizationLevel = require('./options/optimization-level').OptimizationLevel;
+var optimizationLevelFrom = require('./options/optimization-level').optimizationLevelFrom;
+var pluginsFrom = require('./options/plugins');
+var rebaseFrom = require('./options/rebase');
+var rebaseToFrom = require('./options/rebase-to');
+
+var inputSourceMapTracker = require('./reader/input-source-map-tracker');
+var readSources = require('./reader/read-sources');
+
+var serializeStyles = require('./writer/simple');
+var serializeStylesAndSourceMap = require('./writer/source-maps');
+
+var CleanCSS = module.exports = function CleanCSS(options) {
+  options = options || {};
+
+  this.options = {
+    batch: !!options.batch,
+    compatibility: compatibilityFrom(options.compatibility),
+    explicitRebaseTo: 'rebaseTo' in options,
+    fetch: fetchFrom(options.fetch),
+    format: formatFrom(options.format),
+    inline: inlineFrom(options.inline),
+    inlineRequest: inlineRequestFrom(options.inlineRequest),
+    inlineTimeout: inlineTimeoutFrom(options.inlineTimeout),
+    level: optimizationLevelFrom(options.level),
+    plugins: pluginsFrom(options.plugins),
+    rebase: rebaseFrom(options.rebase, options.rebaseTo),
+    rebaseTo: rebaseToFrom(options.rebaseTo),
+    returnPromise: !!options.returnPromise,
+    sourceMap: !!options.sourceMap,
+    sourceMapInlineSources: !!options.sourceMapInlineSources
+  };
+};
+
+// for compatibility with optimize-css-assets-webpack-plugin
+CleanCSS.process = function(input, opts) {
+  var cleanCss;
+  var optsTo = opts.to;
+
+  delete opts.to;
+  cleanCss = new CleanCSS(Object.assign({
+    returnPromise: true, rebaseTo: optsTo
+  }, opts));
+
+  return cleanCss.minify(input)
+    .then(function(output) {
+      return { css: output.styles };
+    });
+};
+
+CleanCSS.prototype.minify = function(input, maybeSourceMap, maybeCallback) {
+  var options = this.options;
+
+  if (options.returnPromise) {
+    return new Promise(function(resolve, reject) {
+      minifyAll(input, options, maybeSourceMap, function(errors, output) {
+        return errors
+          ? reject(errors)
+          : resolve(output);
+      });
+    });
+  }
+  return minifyAll(input, options, maybeSourceMap, maybeCallback);
+};
+
+function minifyAll(input, options, maybeSourceMap, maybeCallback) {
+  if (options.batch && Array.isArray(input)) {
+    return minifyInBatchesFromArray(input, options, maybeSourceMap, maybeCallback);
+  } if (options.batch && (typeof input == 'object')) {
+    return minifyInBatchesFromHash(input, options, maybeSourceMap, maybeCallback);
+  }
+  return minify(input, options, maybeSourceMap, maybeCallback);
+}
+
+function minifyInBatchesFromArray(input, options, maybeSourceMap, maybeCallback) {
+  var callback = typeof maybeCallback == 'function'
+    ? maybeCallback
+    : (typeof maybeSourceMap == 'function' ? maybeSourceMap : null);
+  var errors = [];
+  var outputAsHash = {};
+  var inputValue;
+  var i, l;
+
+  function whenHashBatchDone(innerErrors, output) {
+    outputAsHash = Object.assign(outputAsHash, output);
+
+    if (innerErrors !== null) {
+      errors = errors.concat(innerErrors);
+    }
+  }
+
+  for (i = 0, l = input.length; i < l; i++) {
+    if (typeof input[i] == 'object') {
+      minifyInBatchesFromHash(input[i], options, whenHashBatchDone);
+    } else {
+      inputValue = input[i];
+
+      outputAsHash[inputValue] = minify([inputValue], options);
+      errors = errors.concat(outputAsHash[inputValue].errors);
+    }
+  }
+
+  return callback
+    ? callback(errors.length > 0 ? errors : null, outputAsHash)
+    : outputAsHash;
+}
+
+function minifyInBatchesFromHash(input, options, maybeSourceMap, maybeCallback) {
+  var callback = typeof maybeCallback == 'function'
+    ? maybeCallback
+    : (typeof maybeSourceMap == 'function' ? maybeSourceMap : null);
+  var errors = [];
+  var outputAsHash = {};
+  var inputKey;
+  var inputValue;
+
+  for (inputKey in input) {
+    inputValue = input[inputKey];
+
+    outputAsHash[inputKey] = minify(inputValue.styles, options, inputValue.sourceMap);
+    errors = errors.concat(outputAsHash[inputKey].errors);
+  }
+
+  return callback
+    ? callback(errors.length > 0 ? errors : null, outputAsHash)
+    : outputAsHash;
+}
+
+function minify(input, options, maybeSourceMap, maybeCallback) {
+  var sourceMap = typeof maybeSourceMap != 'function'
+    ? maybeSourceMap
+    : null;
+  var callback = typeof maybeCallback == 'function'
+    ? maybeCallback
+    : (typeof maybeSourceMap == 'function' ? maybeSourceMap : null);
+  var context = {
+    stats: {
+      efficiency: 0,
+      minifiedSize: 0,
+      originalSize: 0,
+      startedAt: Date.now(),
+      timeSpent: 0
+    },
+    cache: { specificity: {} },
+    errors: [],
+    inlinedStylesheets: [],
+    inputSourceMapTracker: inputSourceMapTracker(),
+    localOnly: !callback,
+    options: options,
+    source: null,
+    sourcesContent: {},
+    validator: validator(options.compatibility),
+    warnings: []
+  };
+  var implicitRebaseToWarning;
+
+  if (sourceMap) {
+    context.inputSourceMapTracker.track(undefined, sourceMap);
+  }
+
+  if (options.rebase && !options.explicitRebaseTo) {
+    implicitRebaseToWarning = 'You have set `rebase: true` without giving `rebaseTo` option, which, in this case, defaults to the current working directory. '
+      + 'You are then warned this can lead to unexpected URL rebasing (aka here be dragons)! '
+      + 'If you are OK with the clean-css output, then you can get rid of this warning by giving clean-css a `rebaseTo: process.cwd()` option.';
+    context.warnings.push(implicitRebaseToWarning);
+  }
+
+  return runner(context.localOnly)(function() {
+    return readSources(input, context, function(tokens) {
+      var serialize = context.options.sourceMap
+        ? serializeStylesAndSourceMap
+        : serializeStyles;
+
+      var optimizedTokens = optimize(tokens, context);
+      var optimizedStyles = serialize(optimizedTokens, context);
+      var output = withMetadata(optimizedStyles, context);
+
+      return callback
+        ? callback(context.errors.length > 0 ? context.errors : null, output)
+        : output;
+    });
+  });
+}
+
+function runner(localOnly) {
+  // to always execute code asynchronously when a callback is given
+  // more at blog.izs.me/post/59142742143/designing-apis-for-asynchrony
+  return localOnly
+    ? function(callback) { return callback(); }
+    : process.nextTick;
+}
+
+function optimize(tokens, context) {
+  var optimized = level0Optimize(tokens, context);
+
+  optimized = OptimizationLevel.One in context.options.level
+    ? level1Optimize(tokens, context)
+    : tokens;
+  optimized = OptimizationLevel.Two in context.options.level
+    ? level2Optimize(tokens, context, true)
+    : optimized;
+
+  return optimized;
+}
+
+function withMetadata(output, context) {
+  output.stats = calculateStatsFrom(output.styles, context);
+  output.errors = context.errors;
+  output.inlinedStylesheets = context.inlinedStylesheets;
+  output.warnings = context.warnings;
+
+  return output;
+}
+
+function calculateStatsFrom(styles, context) {
+  var finishedAt = Date.now();
+  var timeSpent = finishedAt - context.stats.startedAt;
+
+  delete context.stats.startedAt;
+  context.stats.timeSpent = timeSpent;
+  context.stats.efficiency = 1 - styles.length / context.stats.originalSize;
+  context.stats.minifiedSize = styles.length;
+
+  return context.stats;
+}
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/clone.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/clone.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/clone.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,33 @@
+var wrapSingle = require('./wrap-for-optimizing').single;
+
+var Token = require('../tokenizer/token');
+
+function deep(property) {
+  var cloned = shallow(property);
+  for (var i = property.components.length - 1; i >= 0; i--) {
+    var component = shallow(property.components[i]);
+    component.value = property.components[i].value.slice(0);
+    cloned.components.unshift(component);
+  }
+
+  cloned.dirty = true;
+  cloned.value = property.value.slice(0);
+
+  return cloned;
+}
+
+function shallow(property) {
+  var cloned = wrapSingle([
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, property.name]
+  ]);
+  cloned.important = property.important;
+  cloned.hack = property.hack;
+  cloned.unused = false;
+  return cloned;
+}
+
+module.exports = {
+  deep: deep,
+  shallow: shallow
+};
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/configuration.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/configuration.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/configuration.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,1640 @@
+// Contains the interpretation of CSS properties, as used by the property optimizer
+
+var breakUp = require('./configuration/break-up');
+var canOverride = require('./configuration/can-override');
+var restore = require('./configuration/restore');
+
+var propertyOptimizers = require('./level-1/property-optimizers');
+var valueOptimizers = require('./level-1/value-optimizers');
+
+var override = require('../utils/override');
+
+// Properties to process
+// Extend this object in order to add support for more properties in the optimizer.
+//
+// Each key in this object represents a CSS property and should be an object.
+// Such an object contains properties that describe how the represented CSS property should be handled.
+// Possible options:
+//
+// * components: array (Only specify for shorthand properties.)
+//   Contains the names of the granular properties this shorthand compacts.
+//
+// * canOverride: function
+//   Returns whether two tokens of this property can be merged with each other.
+//   This property has no meaning for shorthands.
+//
+// * defaultValue: string
+//   Specifies the default value of the property according to the CSS standard.
+//   For shorthand, this is used when every component is set to its default value, therefore it should be the shortest possible default value of all the components.
+//
+// * shortestValue: string
+//   Specifies the shortest possible value the property can possibly have.
+//   (Falls back to defaultValue if unspecified.)
+//
+// * breakUp: function (Only specify for shorthand properties.)
+//   Breaks the shorthand up to its components.
+//
+// * restore: function (Only specify for shorthand properties.)
+//   Puts the shorthand together from its components.
+//
+var configuration = {
+  animation: {
+    canOverride: canOverride.generic.components([
+      canOverride.generic.time,
+      canOverride.generic.timingFunction,
+      canOverride.generic.time,
+      canOverride.property.animationIterationCount,
+      canOverride.property.animationDirection,
+      canOverride.property.animationFillMode,
+      canOverride.property.animationPlayState,
+      canOverride.property.animationName
+    ]),
+    components: [
+      'animation-duration',
+      'animation-timing-function',
+      'animation-delay',
+      'animation-iteration-count',
+      'animation-direction',
+      'animation-fill-mode',
+      'animation-play-state',
+      'animation-name'
+    ],
+    breakUp: breakUp.multiplex(breakUp.animation),
+    defaultValue: 'none',
+    restore: restore.multiplex(restore.withoutDefaults),
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.textQuotes,
+      valueOptimizers.time,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'animation-delay': {
+    canOverride: canOverride.generic.time,
+    componentOf: [
+      'animation'
+    ],
+    defaultValue: '0s',
+    intoMultiplexMode: 'real',
+    valueOptimizers: [
+      valueOptimizers.time,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'animation-direction': {
+    canOverride: canOverride.property.animationDirection,
+    componentOf: [
+      'animation'
+    ],
+    defaultValue: 'normal',
+    intoMultiplexMode: 'real',
+    vendorPrefixes: [
+      '-moz-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'animation-duration': {
+    canOverride: canOverride.generic.time,
+    componentOf: [
+      'animation'
+    ],
+    defaultValue: '0s',
+    intoMultiplexMode: 'real',
+    keepUnlessDefault: 'animation-delay',
+    valueOptimizers: [
+      valueOptimizers.time,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'animation-fill-mode': {
+    canOverride: canOverride.property.animationFillMode,
+    componentOf: [
+      'animation'
+    ],
+    defaultValue: 'none',
+    intoMultiplexMode: 'real',
+    vendorPrefixes: [
+      '-moz-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'animation-iteration-count': {
+    canOverride: canOverride.property.animationIterationCount,
+    componentOf: [
+      'animation'
+    ],
+    defaultValue: '1',
+    intoMultiplexMode: 'real',
+    vendorPrefixes: [
+      '-moz-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'animation-name': {
+    canOverride: canOverride.property.animationName,
+    componentOf: [
+      'animation'
+    ],
+    defaultValue: 'none',
+    intoMultiplexMode: 'real',
+    valueOptimizers: [
+      valueOptimizers.textQuotes
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'animation-play-state': {
+    canOverride: canOverride.property.animationPlayState,
+    componentOf: [
+      'animation'
+    ],
+    defaultValue: 'running',
+    intoMultiplexMode: 'real',
+    vendorPrefixes: [
+      '-moz-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'animation-timing-function': {
+    canOverride: canOverride.generic.timingFunction,
+    componentOf: [
+      'animation'
+    ],
+    defaultValue: 'ease',
+    intoMultiplexMode: 'real',
+    vendorPrefixes: [
+      '-moz-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  background: {
+    canOverride: canOverride.generic.components([
+      canOverride.generic.image,
+      canOverride.property.backgroundPosition,
+      canOverride.property.backgroundSize,
+      canOverride.property.backgroundRepeat,
+      canOverride.property.backgroundAttachment,
+      canOverride.property.backgroundOrigin,
+      canOverride.property.backgroundClip,
+      canOverride.generic.color
+    ]),
+    components: [
+      'background-image',
+      'background-position',
+      'background-size',
+      'background-repeat',
+      'background-attachment',
+      'background-origin',
+      'background-clip',
+      'background-color'
+    ],
+    breakUp: breakUp.multiplex(breakUp.background),
+    defaultValue: '0 0',
+    propertyOptimizer: propertyOptimizers.background,
+    restore: restore.multiplex(restore.background),
+    shortestValue: '0',
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.urlWhiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.zero,
+      valueOptimizers.color,
+      valueOptimizers.urlPrefix,
+      valueOptimizers.urlQuotes
+    ]
+  },
+  'background-attachment': {
+    canOverride: canOverride.property.backgroundAttachment,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'scroll',
+    intoMultiplexMode: 'real'
+  },
+  'background-clip': {
+    canOverride: canOverride.property.backgroundClip,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'border-box',
+    intoMultiplexMode: 'real',
+    shortestValue: 'border-box'
+  },
+  'background-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'transparent',
+    intoMultiplexMode: 'real', // otherwise real color will turn into default since color appears in last multiplex only
+    multiplexLastOnly: true,
+    nonMergeableValue: 'none',
+    shortestValue: 'red',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.color
+    ]
+  },
+  'background-image': {
+    canOverride: canOverride.generic.image,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'none',
+    intoMultiplexMode: 'default',
+    valueOptimizers: [
+      valueOptimizers.urlWhiteSpace,
+      valueOptimizers.urlPrefix,
+      valueOptimizers.urlQuotes,
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero,
+      valueOptimizers.color
+    ]
+  },
+  'background-origin': {
+    canOverride: canOverride.property.backgroundOrigin,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'padding-box',
+    intoMultiplexMode: 'real',
+    shortestValue: 'border-box'
+  },
+  'background-position': {
+    canOverride: canOverride.property.backgroundPosition,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: ['0', '0'],
+    doubleValues: true,
+    intoMultiplexMode: 'real',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'background-repeat': {
+    canOverride: canOverride.property.backgroundRepeat,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: ['repeat'],
+    doubleValues: true,
+    intoMultiplexMode: 'real'
+  },
+  'background-size': {
+    canOverride: canOverride.property.backgroundSize,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: ['auto'],
+    doubleValues: true,
+    intoMultiplexMode: 'real',
+    shortestValue: '0 0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  bottom: {
+    canOverride: canOverride.property.bottom,
+    defaultValue: 'auto',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  border: {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-width',
+      'border-style',
+      'border-color'
+    ],
+    defaultValue: 'none',
+    overridesShorthands: [
+      'border-bottom',
+      'border-left',
+      'border-right',
+      'border-top'
+    ],
+    restore: restore.withoutDefaults,
+    shorthand: true,
+    shorthandComponents: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.zero,
+      valueOptimizers.color
+    ]
+  },
+  'border-bottom': {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-bottom-width',
+      'border-bottom-style',
+      'border-bottom-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.withoutDefaults,
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.zero,
+      valueOptimizers.color
+    ]
+  },
+  'border-bottom-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'border-bottom',
+      'border-color'
+    ],
+    defaultValue: 'none',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.color
+    ]
+  },
+  'border-bottom-left-radius': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-radius'
+    ],
+    defaultValue: '0',
+    propertyOptimizer: propertyOptimizers.borderRadius,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-bottom-right-radius': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-radius'
+    ],
+    defaultValue: '0',
+    propertyOptimizer: propertyOptimizers.borderRadius,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-bottom-style': {
+    canOverride: canOverride.property.borderStyle,
+    componentOf: [
+      'border-bottom',
+      'border-style'
+    ],
+    defaultValue: 'none'
+  },
+  'border-bottom-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-bottom',
+      'border-width'
+    ],
+    defaultValue: 'medium',
+    oppositeTo: 'border-top-width',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'border-collapse': {
+    canOverride: canOverride.property.borderCollapse,
+    defaultValue: 'separate'
+  },
+  'border-color': {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.color,
+      canOverride.generic.color,
+      canOverride.generic.color,
+      canOverride.generic.color
+    ]),
+    componentOf: [
+      'border'
+    ],
+    components: [
+      'border-top-color',
+      'border-right-color',
+      'border-bottom-color',
+      'border-left-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.fourValues,
+    shortestValue: 'red',
+    shorthand: true,
+    singleTypeComponents: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.color
+    ]
+  },
+  'border-left': {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-left-width',
+      'border-left-style',
+      'border-left-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.withoutDefaults,
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.zero,
+      valueOptimizers.color
+    ]
+  },
+  'border-left-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'border-color',
+      'border-left'
+    ],
+    defaultValue: 'none',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.color
+    ]
+  },
+  'border-left-style': {
+    canOverride: canOverride.property.borderStyle,
+    componentOf: [
+      'border-left',
+      'border-style'
+    ],
+    defaultValue: 'none'
+  },
+  'border-left-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-left',
+      'border-width'
+    ],
+    defaultValue: 'medium',
+    oppositeTo: 'border-right-width',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'border-radius': {
+    breakUp: breakUp.borderRadius,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit
+    ]),
+    components: [
+      'border-top-left-radius',
+      'border-top-right-radius',
+      'border-bottom-right-radius',
+      'border-bottom-left-radius'
+    ],
+    defaultValue: '0',
+    propertyOptimizer: propertyOptimizers.borderRadius,
+    restore: restore.borderRadius,
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-right': {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-right-width',
+      'border-right-style',
+      'border-right-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.withoutDefaults,
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.color
+    ]
+  },
+  'border-right-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'border-color',
+      'border-right'
+    ],
+    defaultValue: 'none',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.color
+    ]
+  },
+  'border-right-style': {
+    canOverride: canOverride.property.borderStyle,
+    componentOf: [
+      'border-right',
+      'border-style'
+    ],
+    defaultValue: 'none'
+  },
+  'border-right-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-right',
+      'border-width'
+    ],
+    defaultValue: 'medium',
+    oppositeTo: 'border-left-width',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'border-style': {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.property.borderStyle,
+      canOverride.property.borderStyle,
+      canOverride.property.borderStyle,
+      canOverride.property.borderStyle
+    ]),
+    componentOf: [
+      'border'
+    ],
+    components: [
+      'border-top-style',
+      'border-right-style',
+      'border-bottom-style',
+      'border-left-style'
+    ],
+    defaultValue: 'none',
+    restore: restore.fourValues,
+    shorthand: true,
+    singleTypeComponents: true
+  },
+  'border-top': {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-top-width',
+      'border-top-style',
+      'border-top-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.withoutDefaults,
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.zero,
+      valueOptimizers.color,
+      valueOptimizers.unit
+    ]
+  },
+  'border-top-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'border-color',
+      'border-top'
+    ],
+    defaultValue: 'none',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.color
+    ]
+  },
+  'border-top-left-radius': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-radius'
+    ],
+    defaultValue: '0',
+    propertyOptimizer: propertyOptimizers.borderRadius,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-top-right-radius': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-radius'
+    ],
+    defaultValue: '0',
+    propertyOptimizer: propertyOptimizers.borderRadius,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-top-style': {
+    canOverride: canOverride.property.borderStyle,
+    componentOf: [
+      'border-style',
+      'border-top'
+    ],
+    defaultValue: 'none'
+  },
+  'border-top-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-top',
+      'border-width'
+    ],
+    defaultValue: 'medium',
+    oppositeTo: 'border-bottom-width',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'border-width': {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit
+    ]),
+    componentOf: [
+      'border'
+    ],
+    components: [
+      'border-top-width',
+      'border-right-width',
+      'border-bottom-width',
+      'border-left-width'
+    ],
+    defaultValue: 'medium',
+    restore: restore.fourValues,
+    shortestValue: '0',
+    shorthand: true,
+    singleTypeComponents: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'box-shadow': {
+    propertyOptimizer: propertyOptimizers.boxShadow,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero,
+      valueOptimizers.color
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-ms-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  clear: {
+    canOverride: canOverride.property.clear,
+    defaultValue: 'none'
+  },
+  clip: {
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  color: {
+    canOverride: canOverride.generic.color,
+    defaultValue: 'transparent',
+    shortestValue: 'red',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.color
+    ]
+  },
+  'column-gap': {
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  cursor: {
+    canOverride: canOverride.property.cursor,
+    defaultValue: 'auto'
+  },
+  display: { canOverride: canOverride.property.display },
+  filter: {
+    propertyOptimizer: propertyOptimizers.filter,
+    valueOptimizers: [
+      valueOptimizers.fraction
+    ]
+  },
+  float: {
+    canOverride: canOverride.property.float,
+    defaultValue: 'none'
+  },
+  font: {
+    breakUp: breakUp.font,
+    canOverride: canOverride.generic.components([
+      canOverride.property.fontStyle,
+      canOverride.property.fontVariant,
+      canOverride.property.fontWeight,
+      canOverride.property.fontStretch,
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.property.fontFamily
+    ]),
+    components: [
+      'font-style',
+      'font-variant',
+      'font-weight',
+      'font-stretch',
+      'font-size',
+      'line-height',
+      'font-family'
+    ],
+    restore: restore.font,
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.textQuotes
+    ]
+  },
+  'font-family': {
+    canOverride: canOverride.property.fontFamily,
+    defaultValue: 'user|agent|specific',
+    valueOptimizers: [
+      valueOptimizers.textQuotes
+    ]
+  },
+  'font-size': {
+    canOverride: canOverride.generic.unit,
+    defaultValue: 'medium',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.fraction
+    ]
+  },
+  'font-stretch': {
+    canOverride: canOverride.property.fontStretch,
+    defaultValue: 'normal'
+  },
+  'font-style': {
+    canOverride: canOverride.property.fontStyle,
+    defaultValue: 'normal'
+  },
+  'font-variant': {
+    canOverride: canOverride.property.fontVariant,
+    defaultValue: 'normal'
+  },
+  'font-weight': {
+    canOverride: canOverride.property.fontWeight,
+    defaultValue: 'normal',
+    propertyOptimizer: propertyOptimizers.fontWeight,
+    shortestValue: '400'
+  },
+  gap: {
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  height: {
+    canOverride: canOverride.generic.unit,
+    defaultValue: 'auto',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  left: {
+    canOverride: canOverride.property.left,
+    defaultValue: 'auto',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'letter-spacing': {
+    valueOptimizers: [
+      valueOptimizers.fraction,
+      valueOptimizers.zero
+    ]
+  },
+  'line-height': {
+    canOverride: canOverride.generic.unitOrNumber,
+    defaultValue: 'normal',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.fraction,
+      valueOptimizers.zero
+    ]
+  },
+  'list-style': {
+    canOverride: canOverride.generic.components([
+      canOverride.property.listStyleType,
+      canOverride.property.listStylePosition,
+      canOverride.property.listStyleImage
+    ]),
+    components: [
+      'list-style-type',
+      'list-style-position',
+      'list-style-image'
+    ],
+    breakUp: breakUp.listStyle,
+    restore: restore.withoutDefaults,
+    defaultValue: 'outside', // can't use 'disc' because that'd override default 'decimal' for <ol>
+    shortestValue: 'none',
+    shorthand: true
+  },
+  'list-style-image': {
+    canOverride: canOverride.generic.image,
+    componentOf: [
+      'list-style'
+    ],
+    defaultValue: 'none'
+  },
+  'list-style-position': {
+    canOverride: canOverride.property.listStylePosition,
+    componentOf: [
+      'list-style'
+    ],
+    defaultValue: 'outside',
+    shortestValue: 'inside'
+  },
+  'list-style-type': {
+    canOverride: canOverride.property.listStyleType,
+    componentOf: [
+      'list-style'
+    ],
+    // NOTE: we can't tell the real default value here, it's 'disc' for <ul> and 'decimal' for <ol>
+    // this is a hack, but it doesn't matter because this value will be either overridden or
+    // it will disappear at the final step anyway
+    defaultValue: 'decimal|disc',
+    shortestValue: 'none'
+  },
+  margin: {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit
+    ]),
+    components: [
+      'margin-top',
+      'margin-right',
+      'margin-bottom',
+      'margin-left'
+    ],
+    defaultValue: '0',
+    propertyOptimizer: propertyOptimizers.margin,
+    restore: restore.fourValues,
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'margin-bottom': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'margin'
+    ],
+    defaultValue: '0',
+    oppositeTo: 'margin-top',
+    propertyOptimizer: propertyOptimizers.margin,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'margin-inline-end': {
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'margin-inline-start': {
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'margin-left': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'margin'
+    ],
+    defaultValue: '0',
+    oppositeTo: 'margin-right',
+    propertyOptimizer: propertyOptimizers.margin,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'margin-right': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'margin'
+    ],
+    defaultValue: '0',
+    oppositeTo: 'margin-left',
+    propertyOptimizer: propertyOptimizers.margin,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'margin-top': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'margin'
+    ],
+    defaultValue: '0',
+    oppositeTo: 'margin-bottom',
+    propertyOptimizer: propertyOptimizers.margin,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'max-height': {
+    canOverride: canOverride.generic.unit,
+    defaultValue: 'none',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'max-width': {
+    canOverride: canOverride.generic.unit,
+    defaultValue: 'none',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'min-height': {
+    canOverride: canOverride.generic.unit,
+    defaultValue: '0',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'min-width': {
+    canOverride: canOverride.generic.unit,
+    defaultValue: '0',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  opacity: {
+    valueOptimizers: [
+      valueOptimizers.fraction,
+      valueOptimizers.precision
+    ]
+  },
+  outline: {
+    canOverride: canOverride.generic.components([
+      canOverride.generic.color,
+      canOverride.property.outlineStyle,
+      canOverride.generic.unit
+    ]),
+    components: [
+      'outline-color',
+      'outline-style',
+      'outline-width'
+    ],
+    breakUp: breakUp.outline,
+    restore: restore.withoutDefaults,
+    defaultValue: '0',
+    propertyOptimizer: propertyOptimizers.outline,
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'outline-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'outline'
+    ],
+    defaultValue: 'invert',
+    shortestValue: 'red',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.color
+    ]
+  },
+  'outline-style': {
+    canOverride: canOverride.property.outlineStyle,
+    componentOf: [
+      'outline'
+    ],
+    defaultValue: 'none'
+  },
+  'outline-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'outline'
+    ],
+    defaultValue: 'medium',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  overflow: {
+    canOverride: canOverride.property.overflow,
+    defaultValue: 'visible'
+  },
+  'overflow-x': {
+    canOverride: canOverride.property.overflow,
+    defaultValue: 'visible'
+  },
+  'overflow-y': {
+    canOverride: canOverride.property.overflow,
+    defaultValue: 'visible'
+  },
+  padding: {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit
+    ]),
+    components: [
+      'padding-top',
+      'padding-right',
+      'padding-bottom',
+      'padding-left'
+    ],
+    defaultValue: '0',
+    propertyOptimizer: propertyOptimizers.padding,
+    restore: restore.fourValues,
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'padding-bottom': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'padding'
+    ],
+    defaultValue: '0',
+    oppositeTo: 'padding-top',
+    propertyOptimizer: propertyOptimizers.padding,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'padding-left': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'padding'
+    ],
+    defaultValue: '0',
+    oppositeTo: 'padding-right',
+    propertyOptimizer: propertyOptimizers.padding,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'padding-right': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'padding'
+    ],
+    defaultValue: '0',
+    oppositeTo: 'padding-left',
+    propertyOptimizer: propertyOptimizers.padding,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'padding-top': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'padding'
+    ],
+    defaultValue: '0',
+    oppositeTo: 'padding-bottom',
+    propertyOptimizer: propertyOptimizers.padding,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  position: {
+    canOverride: canOverride.property.position,
+    defaultValue: 'static'
+  },
+  right: {
+    canOverride: canOverride.property.right,
+    defaultValue: 'auto',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'row-gap': {
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  src: {
+    valueOptimizers: [
+      valueOptimizers.urlWhiteSpace,
+      valueOptimizers.urlPrefix,
+      valueOptimizers.urlQuotes
+    ]
+  },
+  'stroke-width': {
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'text-align': {
+    canOverride: canOverride.property.textAlign,
+    // NOTE: we can't tell the real default value here, as it depends on default text direction
+    // this is a hack, but it doesn't matter because this value will be either overridden or
+    // it will disappear anyway
+    defaultValue: 'left|right'
+  },
+  'text-decoration': {
+    canOverride: canOverride.property.textDecoration,
+    defaultValue: 'none'
+  },
+  'text-indent': {
+    canOverride: canOverride.property.textOverflow,
+    defaultValue: 'none',
+    valueOptimizers: [
+      valueOptimizers.fraction,
+      valueOptimizers.zero
+    ]
+  },
+  'text-overflow': {
+    canOverride: canOverride.property.textOverflow,
+    defaultValue: 'none'
+  },
+  'text-shadow': {
+    canOverride: canOverride.property.textShadow,
+    defaultValue: 'none',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.zero,
+      valueOptimizers.color
+    ]
+  },
+  top: {
+    canOverride: canOverride.property.top,
+    defaultValue: 'auto',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  transform: {
+    canOverride: canOverride.property.transform,
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.degrees,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-ms-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  transition: {
+    breakUp: breakUp.multiplex(breakUp.transition),
+    canOverride: canOverride.generic.components([
+      canOverride.property.transitionProperty,
+      canOverride.generic.time,
+      canOverride.generic.timingFunction,
+      canOverride.generic.time
+    ]),
+    components: [
+      'transition-property',
+      'transition-duration',
+      'transition-timing-function',
+      'transition-delay'
+    ],
+    defaultValue: 'none',
+    restore: restore.multiplex(restore.withoutDefaults),
+    shorthand: true,
+    valueOptimizers: [
+      valueOptimizers.time,
+      valueOptimizers.fraction
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-ms-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'transition-delay': {
+    canOverride: canOverride.generic.time,
+    componentOf: [
+      'transition'
+    ],
+    defaultValue: '0s',
+    intoMultiplexMode: 'real',
+    valueOptimizers: [
+      valueOptimizers.time
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-ms-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'transition-duration': {
+    canOverride: canOverride.generic.time,
+    componentOf: [
+      'transition'
+    ],
+    defaultValue: '0s',
+    intoMultiplexMode: 'real',
+    keepUnlessDefault: 'transition-delay',
+    valueOptimizers: [
+      valueOptimizers.time,
+      valueOptimizers.fraction
+    ],
+    vendorPrefixes: [
+      '-moz-',
+      '-ms-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'transition-property': {
+    canOverride: canOverride.generic.propertyName,
+    componentOf: [
+      'transition'
+    ],
+    defaultValue: 'all',
+    intoMultiplexMode: 'placeholder',
+    placeholderValue: '_', // it's a short value that won't match any property and still be a valid `transition-property`
+    vendorPrefixes: [
+      '-moz-',
+      '-ms-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'transition-timing-function': {
+    canOverride: canOverride.generic.timingFunction,
+    componentOf: [
+      'transition'
+    ],
+    defaultValue: 'ease',
+    intoMultiplexMode: 'real',
+    vendorPrefixes: [
+      '-moz-',
+      '-ms-',
+      '-o-',
+      '-webkit-'
+    ]
+  },
+  'vertical-align': {
+    canOverride: canOverride.property.verticalAlign,
+    defaultValue: 'baseline',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  visibility: {
+    canOverride: canOverride.property.visibility,
+    defaultValue: 'visible'
+  },
+  '-webkit-tap-highlight-color': {
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.color
+    ]
+  },
+  '-webkit-margin-end': {
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'white-space': {
+    canOverride: canOverride.property.whiteSpace,
+    defaultValue: 'normal'
+  },
+  width: {
+    canOverride: canOverride.generic.unit,
+    defaultValue: 'auto',
+    shortestValue: '0',
+    valueOptimizers: [
+      valueOptimizers.whiteSpace,
+      valueOptimizers.fraction,
+      valueOptimizers.precision,
+      valueOptimizers.unit,
+      valueOptimizers.zero
+    ]
+  },
+  'z-index': {
+    canOverride: canOverride.property.zIndex,
+    defaultValue: 'auto'
+  }
+};
+
+// generate vendor-prefixed configuration
+var vendorPrefixedConfiguration = {};
+
+function cloneDescriptor(propertyName, prefix) {
+  var clonedDescriptor = override(configuration[propertyName], {});
+
+  if ('componentOf' in clonedDescriptor) {
+    clonedDescriptor.componentOf = clonedDescriptor.componentOf.map(function(shorthandName) {
+      return prefix + shorthandName;
+    });
+  }
+
+  if ('components' in clonedDescriptor) {
+    clonedDescriptor.components = clonedDescriptor.components.map(function(longhandName) {
+      return prefix + longhandName;
+    });
+  }
+
+  if ('keepUnlessDefault' in clonedDescriptor) {
+    clonedDescriptor.keepUnlessDefault = prefix + clonedDescriptor.keepUnlessDefault;
+  }
+
+  return clonedDescriptor;
+}
+
+for (var propertyName in configuration) {
+  var descriptor = configuration[propertyName];
+
+  if (!('vendorPrefixes' in descriptor)) {
+    continue;
+  }
+
+  for (var i = 0; i < descriptor.vendorPrefixes.length; i++) {
+    var prefix = descriptor.vendorPrefixes[i];
+    var clonedDescriptor = cloneDescriptor(propertyName, prefix);
+    delete clonedDescriptor.vendorPrefixes;
+
+    vendorPrefixedConfiguration[prefix + propertyName] = clonedDescriptor;
+  }
+
+  delete descriptor.vendorPrefixes;
+}
+
+module.exports = override(configuration, vendorPrefixedConfiguration);
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/break-up.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/break-up.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/break-up.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,656 @@
+var InvalidPropertyError = require('../invalid-property-error');
+
+var wrapSingle = require('../wrap-for-optimizing').single;
+
+var Token = require('../../tokenizer/token');
+var Marker = require('../../tokenizer/marker');
+
+var formatPosition = require('../../utils/format-position');
+
+function _anyIsInherit(values) {
+  var i, l;
+
+  for (i = 0, l = values.length; i < l; i++) {
+    if (values[i][1] == 'inherit') {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function _colorFilter(validator) {
+  return function(value) {
+    return value[1] == 'invert' || validator.isColor(value[1]) || validator.isPrefixed(value[1]);
+  };
+}
+
+function _styleFilter(validator) {
+  return function(value) {
+    return value[1] != 'inherit' && validator.isStyleKeyword(value[1]) && !validator.isColorFunction(value[1]);
+  };
+}
+
+function _wrapDefault(name, property, configuration) {
+  var descriptor = configuration[name];
+  if (descriptor.doubleValues && descriptor.defaultValue.length == 2) {
+    return wrapSingle([
+      Token.PROPERTY,
+      [Token.PROPERTY_NAME, name],
+      [Token.PROPERTY_VALUE, descriptor.defaultValue[0]],
+      [Token.PROPERTY_VALUE, descriptor.defaultValue[1]]
+    ]);
+  } if (descriptor.doubleValues && descriptor.defaultValue.length == 1) {
+    return wrapSingle([
+      Token.PROPERTY,
+      [Token.PROPERTY_NAME, name],
+      [Token.PROPERTY_VALUE, descriptor.defaultValue[0]]
+    ]);
+  }
+  return wrapSingle([
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, name],
+    [Token.PROPERTY_VALUE, descriptor.defaultValue]
+  ]);
+}
+
+function _widthFilter(validator) {
+  return function(value) {
+    return value[1] != 'inherit'
+      && (validator.isWidth(value[1]) || validator.isUnit(value[1]) || validator.isDynamicUnit(value[1]))
+      && !validator.isStyleKeyword(value[1])
+      && !validator.isColorFunction(value[1]);
+  };
+}
+
+function animation(property, configuration, validator) {
+  var duration = _wrapDefault(property.name + '-duration', property, configuration);
+  var timing = _wrapDefault(property.name + '-timing-function', property, configuration);
+  var delay = _wrapDefault(property.name + '-delay', property, configuration);
+  var iteration = _wrapDefault(property.name + '-iteration-count', property, configuration);
+  var direction = _wrapDefault(property.name + '-direction', property, configuration);
+  var fill = _wrapDefault(property.name + '-fill-mode', property, configuration);
+  var play = _wrapDefault(property.name + '-play-state', property, configuration);
+  var name = _wrapDefault(property.name + '-name', property, configuration);
+  var components = [duration, timing, delay, iteration, direction, fill, play, name];
+  var values = property.value;
+  var value;
+  var durationSet = false;
+  var timingSet = false;
+  var delaySet = false;
+  var iterationSet = false;
+  var directionSet = false;
+  var fillSet = false;
+  var playSet = false;
+  var nameSet = false;
+  var i;
+  var l;
+
+  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
+    // eslint-disable-next-line max-len
+    duration.value = timing.value = delay.value = iteration.value = direction.value = fill.value = play.value = name.value = property.value;
+    return components;
+  }
+
+  if (values.length > 1 && _anyIsInherit(values)) {
+    throw new InvalidPropertyError('Invalid animation values at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  for (i = 0, l = values.length; i < l; i++) {
+    value = values[i];
+
+    if (validator.isTime(value[1]) && !durationSet) {
+      duration.value = [value];
+      durationSet = true;
+    } else if (validator.isTime(value[1]) && !delaySet) {
+      delay.value = [value];
+      delaySet = true;
+    } else if ((validator.isGlobal(value[1]) || validator.isTimingFunction(value[1])) && !timingSet) {
+      timing.value = [value];
+      timingSet = true;
+    } else if ((validator.isAnimationIterationCountKeyword(value[1])
+      || validator.isPositiveNumber(value[1]))
+      && !iterationSet) {
+      iteration.value = [value];
+      iterationSet = true;
+    } else if (validator.isAnimationDirectionKeyword(value[1]) && !directionSet) {
+      direction.value = [value];
+      directionSet = true;
+    } else if (validator.isAnimationFillModeKeyword(value[1]) && !fillSet) {
+      fill.value = [value];
+      fillSet = true;
+    } else if (validator.isAnimationPlayStateKeyword(value[1]) && !playSet) {
+      play.value = [value];
+      playSet = true;
+    } else if ((validator.isAnimationNameKeyword(value[1]) || validator.isIdentifier(value[1])) && !nameSet) {
+      name.value = [value];
+      nameSet = true;
+    } else {
+      throw new InvalidPropertyError('Invalid animation value at ' + formatPosition(value[2][0]) + '. Ignoring.');
+    }
+  }
+
+  return components;
+}
+
+function background(property, configuration, validator) {
+  var image = _wrapDefault('background-image', property, configuration);
+  var position = _wrapDefault('background-position', property, configuration);
+  var size = _wrapDefault('background-size', property, configuration);
+  var repeat = _wrapDefault('background-repeat', property, configuration);
+  var attachment = _wrapDefault('background-attachment', property, configuration);
+  var origin = _wrapDefault('background-origin', property, configuration);
+  var clip = _wrapDefault('background-clip', property, configuration);
+  var color = _wrapDefault('background-color', property, configuration);
+  var components = [image, position, size, repeat, attachment, origin, clip, color];
+  var values = property.value;
+
+  var positionSet = false;
+  var clipSet = false;
+  var originSet = false;
+  var repeatSet = false;
+
+  var anyValueSet = false;
+
+  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
+    // NOTE: 'inherit' is not a valid value for background-attachment
+    color.value = image.value = repeat.value = position.value = size.value = origin.value = clip.value = property.value;
+    return components;
+  }
+
+  if (property.value.length == 1 && property.value[0][1] == '0 0') {
+    return components;
+  }
+
+  for (var i = values.length - 1; i >= 0; i--) {
+    var value = values[i];
+
+    if (validator.isBackgroundAttachmentKeyword(value[1])) {
+      attachment.value = [value];
+      anyValueSet = true;
+    } else if (validator.isBackgroundClipKeyword(value[1]) || validator.isBackgroundOriginKeyword(value[1])) {
+      if (clipSet) {
+        origin.value = [value];
+        originSet = true;
+      } else {
+        clip.value = [value];
+        clipSet = true;
+      }
+      anyValueSet = true;
+    } else if (validator.isBackgroundRepeatKeyword(value[1])) {
+      if (repeatSet) {
+        repeat.value.unshift(value);
+      } else {
+        repeat.value = [value];
+        repeatSet = true;
+      }
+      anyValueSet = true;
+    } else if (validator.isBackgroundPositionKeyword(value[1])
+    || validator.isBackgroundSizeKeyword(value[1])
+    || validator.isUnit(value[1])
+    || validator.isDynamicUnit(value[1])) {
+      if (i > 0) {
+        var previousValue = values[i - 1];
+
+        if (previousValue[1] == Marker.FORWARD_SLASH) {
+          size.value = [value];
+        } else if (i > 1 && values[i - 2][1] == Marker.FORWARD_SLASH) {
+          size.value = [previousValue, value];
+          i -= 2;
+        } else {
+          if (!positionSet) { position.value = []; }
+
+          position.value.unshift(value);
+          positionSet = true;
+        }
+      } else {
+        if (!positionSet) { position.value = []; }
+
+        position.value.unshift(value);
+        positionSet = true;
+      }
+      anyValueSet = true;
+    } else if ((color.value[0][1] == configuration[color.name].defaultValue || color.value[0][1] == 'none') && (validator.isColor(value[1]) || validator.isPrefixed(value[1]))) {
+      color.value = [value];
+      anyValueSet = true;
+    } else if (validator.isUrl(value[1]) || validator.isFunction(value[1])) {
+      image.value = [value];
+      anyValueSet = true;
+    }
+  }
+
+  if (clipSet && !originSet) { origin.value = clip.value.slice(0); }
+
+  if (!anyValueSet) {
+    throw new InvalidPropertyError('Invalid background value at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  return components;
+}
+
+function borderRadius(property, configuration) {
+  var values = property.value;
+  var splitAt = -1;
+
+  for (var i = 0, l = values.length; i < l; i++) {
+    if (values[i][1] == Marker.FORWARD_SLASH) {
+      splitAt = i;
+      break;
+    }
+  }
+
+  if (splitAt === 0 || splitAt === values.length - 1) {
+    throw new InvalidPropertyError('Invalid border-radius value at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  var target = _wrapDefault(property.name, property, configuration);
+  target.value = splitAt > -1
+    ? values.slice(0, splitAt)
+    : values.slice(0);
+  target.components = fourValues(target, configuration);
+
+  var remainder = _wrapDefault(property.name, property, configuration);
+  remainder.value = splitAt > -1
+    ? values.slice(splitAt + 1)
+    : values.slice(0);
+  remainder.components = fourValues(remainder, configuration);
+
+  for (var j = 0; j < 4; j++) {
+    target.components[j].multiplex = true;
+    target.components[j].value = target.components[j].value.concat(remainder.components[j].value);
+  }
+
+  return target.components;
+}
+
+function font(property, configuration, validator) {
+  var style = _wrapDefault('font-style', property, configuration);
+  var variant = _wrapDefault('font-variant', property, configuration);
+  var weight = _wrapDefault('font-weight', property, configuration);
+  var stretch = _wrapDefault('font-stretch', property, configuration);
+  var size = _wrapDefault('font-size', property, configuration);
+  var height = _wrapDefault('line-height', property, configuration);
+  var family = _wrapDefault('font-family', property, configuration);
+  var components = [style, variant, weight, stretch, size, height, family];
+  var values = property.value;
+  var fuzzyMatched = 4; // style, variant, weight, and stretch
+  var index = 0;
+  var isStretchSet = false;
+  var isStretchValid;
+  var isStyleSet = false;
+  var isStyleValid;
+  var isVariantSet = false;
+  var isVariantValid;
+  var isWeightSet = false;
+  var isWeightValid;
+  var appendableFamilyName = false;
+
+  if (!values[index]) {
+    throw new InvalidPropertyError('Missing font values at ' + formatPosition(property.all[property.position][1][2][0]) + '. Ignoring.');
+  }
+
+  if (values.length == 1 && values[0][1] == 'inherit') {
+    style.value = variant.value = weight.value = stretch.value = size.value = height.value = family.value = values;
+    return components;
+  }
+
+  if (values.length == 1
+    && (validator.isFontKeyword(values[0][1])
+    || validator.isGlobal(values[0][1])
+    || validator.isPrefixed(values[0][1]))
+  ) {
+    values[0][1] = Marker.INTERNAL + values[0][1];
+    style.value = variant.value = weight.value = stretch.value = size.value = height.value = family.value = values;
+    return components;
+  }
+
+  if (values.length < 2 || !_anyIsFontSize(values, validator) || !_anyIsFontFamily(values, validator)) {
+    throw new InvalidPropertyError('Invalid font values at ' + formatPosition(property.all[property.position][1][2][0]) + '. Ignoring.');
+  }
+
+  if (values.length > 1 && _anyIsInherit(values)) {
+    throw new InvalidPropertyError('Invalid font values at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  // fuzzy match style, variant, weight, and stretch on first elements
+  while (index < fuzzyMatched) {
+    isStretchValid = validator.isFontStretchKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
+    isStyleValid = validator.isFontStyleKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
+    isVariantValid = validator.isFontVariantKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
+    isWeightValid = validator.isFontWeightKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
+
+    if (isStyleValid && !isStyleSet) {
+      style.value = [values[index]];
+      isStyleSet = true;
+    } else if (isVariantValid && !isVariantSet) {
+      variant.value = [values[index]];
+      isVariantSet = true;
+    } else if (isWeightValid && !isWeightSet) {
+      weight.value = [values[index]];
+      isWeightSet = true;
+    } else if (isStretchValid && !isStretchSet) {
+      stretch.value = [values[index]];
+      isStretchSet = true;
+    } else if (isStyleValid
+      && isStyleSet
+      || isVariantValid
+      && isVariantSet
+      || isWeightValid
+      && isWeightSet
+      || isStretchValid
+      && isStretchSet) {
+      throw new InvalidPropertyError('Invalid font style / variant / weight / stretch value at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+    } else {
+      break;
+    }
+
+    index++;
+  }
+
+  // now comes font-size ...
+  if (validator.isFontSizeKeyword(values[index][1])
+    || validator.isUnit(values[index][1])
+    && !validator.isDynamicUnit(values[index][1])) {
+    size.value = [values[index]];
+    index++;
+  } else {
+    throw new InvalidPropertyError('Missing font size at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  if (!values[index]) {
+    throw new InvalidPropertyError('Missing font family at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  // ... and perhaps line-height
+  if (values[index]
+    && values[index][1] == Marker.FORWARD_SLASH
+    && values[index + 1]
+    && (validator.isLineHeightKeyword(values[index + 1][1])
+    || validator.isUnit(values[index + 1][1])
+    || validator.isNumber(values[index + 1][1]))) {
+    height.value = [values[index + 1]];
+    index++;
+    index++;
+  }
+
+  // ... and whatever comes next is font-family
+  family.value = [];
+
+  while (values[index]) {
+    if (values[index][1] == Marker.COMMA) {
+      appendableFamilyName = false;
+    } else {
+      if (appendableFamilyName) {
+        family.value[family.value.length - 1][1] += Marker.SPACE + values[index][1];
+      } else {
+        family.value.push(values[index]);
+      }
+
+      appendableFamilyName = true;
+    }
+
+    index++;
+  }
+
+  if (family.value.length === 0) {
+    throw new InvalidPropertyError('Missing font family at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  return components;
+}
+
+function _anyIsFontSize(values, validator) {
+  var value;
+  var i, l;
+
+  for (i = 0, l = values.length; i < l; i++) {
+    value = values[i];
+
+    if (validator.isFontSizeKeyword(value[1])
+      || validator.isUnit(value[1])
+      && !validator.isDynamicUnit(value[1])
+      || validator.isFunction(value[1])) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function _anyIsFontFamily(values, validator) {
+  var value;
+  var i, l;
+
+  for (i = 0, l = values.length; i < l; i++) {
+    value = values[i];
+
+    if (validator.isIdentifier(value[1]) || validator.isQuotedText(value[1])) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function fourValues(property, configuration) {
+  var componentNames = configuration[property.name].components;
+  var components = [];
+  var value = property.value;
+
+  if (value.length < 1) { return []; }
+
+  if (value.length < 2) { value[1] = value[0].slice(0); }
+  if (value.length < 3) { value[2] = value[0].slice(0); }
+  if (value.length < 4) { value[3] = value[1].slice(0); }
+
+  for (var i = componentNames.length - 1; i >= 0; i--) {
+    var component = wrapSingle([
+      Token.PROPERTY,
+      [Token.PROPERTY_NAME, componentNames[i]]
+    ]);
+    component.value = [value[i]];
+    components.unshift(component);
+  }
+
+  return components;
+}
+
+function multiplex(splitWith) {
+  return function(property, configuration, validator) {
+    var splitsAt = [];
+    var values = property.value;
+    var i, j, l, m;
+
+    // find split commas
+    for (i = 0, l = values.length; i < l; i++) {
+      if (values[i][1] == ',') { splitsAt.push(i); }
+    }
+
+    if (splitsAt.length === 0) { return splitWith(property, configuration, validator); }
+
+    var splitComponents = [];
+
+    // split over commas, and into components
+    for (i = 0, l = splitsAt.length; i <= l; i++) {
+      var from = i === 0 ? 0 : splitsAt[i - 1] + 1;
+      var to = i < l ? splitsAt[i] : values.length;
+
+      var _property = _wrapDefault(property.name, property, configuration);
+      _property.value = values.slice(from, to);
+
+      if (_property.value.length > 0) {
+        splitComponents.push(splitWith(_property, configuration, validator));
+      }
+    }
+
+    var components = splitComponents[0];
+
+    // group component values from each split
+    for (i = 0, l = components.length; i < l; i++) {
+      components[i].multiplex = true;
+
+      for (j = 1, m = splitComponents.length; j < m; j++) {
+        components[i].value.push([Token.PROPERTY_VALUE, Marker.COMMA]);
+        Array.prototype.push.apply(components[i].value, splitComponents[j][i].value);
+      }
+    }
+
+    return components;
+  };
+}
+
+function listStyle(property, configuration, validator) {
+  var type = _wrapDefault('list-style-type', property, configuration);
+  var position = _wrapDefault('list-style-position', property, configuration);
+  var image = _wrapDefault('list-style-image', property, configuration);
+  var components = [type, position, image];
+
+  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
+    type.value = position.value = image.value = [property.value[0]];
+    return components;
+  }
+
+  var values = property.value.slice(0);
+  var total = values.length;
+  var index = 0;
+
+  // `image` first...
+  for (index = 0, total = values.length; index < total; index++) {
+    if (validator.isUrl(values[index][1]) || values[index][1] == '0') {
+      image.value = [values[index]];
+      values.splice(index, 1);
+      break;
+    }
+  }
+
+  // ... then `position`
+  for (index = 0, total = values.length; index < total; index++) {
+    if (validator.isListStylePositionKeyword(values[index][1])) {
+      position.value = [values[index]];
+      values.splice(index, 1);
+      break;
+    }
+  }
+
+  // ... and what's left is a `type`
+  if (values.length > 0 && (validator.isListStyleTypeKeyword(values[0][1]) || validator.isIdentifier(values[0][1]))) {
+    type.value = [values[0]];
+  }
+
+  return components;
+}
+
+function transition(property, configuration, validator) {
+  var prop = _wrapDefault(property.name + '-property', property, configuration);
+  var duration = _wrapDefault(property.name + '-duration', property, configuration);
+  var timing = _wrapDefault(property.name + '-timing-function', property, configuration);
+  var delay = _wrapDefault(property.name + '-delay', property, configuration);
+  var components = [prop, duration, timing, delay];
+  var values = property.value;
+  var value;
+  var durationSet = false;
+  var delaySet = false;
+  var propSet = false;
+  var timingSet = false;
+  var i;
+  var l;
+
+  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
+    prop.value = duration.value = timing.value = delay.value = property.value;
+    return components;
+  }
+
+  if (values.length > 1 && _anyIsInherit(values)) {
+    throw new InvalidPropertyError('Invalid animation values at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  for (i = 0, l = values.length; i < l; i++) {
+    value = values[i];
+
+    if (validator.isTime(value[1]) && !durationSet) {
+      duration.value = [value];
+      durationSet = true;
+    } else if (validator.isTime(value[1]) && !delaySet) {
+      delay.value = [value];
+      delaySet = true;
+    } else if ((validator.isGlobal(value[1]) || validator.isTimingFunction(value[1])) && !timingSet) {
+      timing.value = [value];
+      timingSet = true;
+    } else if (validator.isIdentifier(value[1]) && !propSet) {
+      prop.value = [value];
+      propSet = true;
+    } else {
+      throw new InvalidPropertyError('Invalid animation value at ' + formatPosition(value[2][0]) + '. Ignoring.');
+    }
+  }
+
+  return components;
+}
+
+function widthStyleColor(property, configuration, validator) {
+  var descriptor = configuration[property.name];
+  var components = [
+    _wrapDefault(descriptor.components[0], property, configuration),
+    _wrapDefault(descriptor.components[1], property, configuration),
+    _wrapDefault(descriptor.components[2], property, configuration)
+  ];
+  var color, style, width;
+
+  for (var i = 0; i < 3; i++) {
+    var component = components[i];
+
+    if (component.name.indexOf('color') > 0) { color = component; } else if (component.name.indexOf('style') > 0) { style = component; } else { width = component; }
+  }
+
+  if ((property.value.length == 1 && property.value[0][1] == 'inherit')
+      || (property.value.length == 3 && property.value[0][1] == 'inherit' && property.value[1][1] == 'inherit' && property.value[2][1] == 'inherit')) {
+    color.value = style.value = width.value = [property.value[0]];
+    return components;
+  }
+
+  var values = property.value.slice(0);
+  var match, matches;
+
+  // NOTE: usually users don't follow the required order of parts in this shorthand,
+  // so we'll try to parse it caring as little about order as possible
+
+  if (values.length > 0) {
+    matches = values.filter(_widthFilter(validator));
+    match = matches.length > 1 && (matches[0][1] == 'none' || matches[0][1] == 'auto') ? matches[1] : matches[0];
+    if (match) {
+      width.value = [match];
+      values.splice(values.indexOf(match), 1);
+    }
+  }
+
+  if (values.length > 0) {
+    match = values.filter(_styleFilter(validator))[0];
+    if (match) {
+      style.value = [match];
+      values.splice(values.indexOf(match), 1);
+    }
+  }
+
+  if (values.length > 0) {
+    match = values.filter(_colorFilter(validator))[0];
+    if (match) {
+      color.value = [match];
+      values.splice(values.indexOf(match), 1);
+    }
+  }
+
+  return components;
+}
+
+module.exports = {
+  animation: animation,
+  background: background,
+  border: widthStyleColor,
+  borderRadius: borderRadius,
+  font: font,
+  fourValues: fourValues,
+  listStyle: listStyle,
+  multiplex: multiplex,
+  outline: widthStyleColor,
+  transition: transition
+};
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/can-override.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/can-override.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/can-override.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,314 @@
+var understandable = require('./properties/understandable');
+
+function animationIterationCount(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true)
+    && !(validator.isAnimationIterationCountKeyword(value2) || validator.isPositiveNumber(value2))) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  }
+
+  return validator.isAnimationIterationCountKeyword(value2) || validator.isPositiveNumber(value2);
+}
+
+function animationName(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true)
+    && !(validator.isAnimationNameKeyword(value2) || validator.isIdentifier(value2))) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  }
+
+  return validator.isAnimationNameKeyword(value2) || validator.isIdentifier(value2);
+}
+
+function areSameFunction(validator, value1, value2) {
+  if (!validator.isFunction(value1) || !validator.isFunction(value2)) {
+    return false;
+  }
+
+  var function1Name = value1.substring(0, value1.indexOf('('));
+  var function2Name = value2.substring(0, value2.indexOf('('));
+
+  var function1Value = value1.substring(function1Name.length + 1, value1.length - 1);
+  var function2Value = value2.substring(function2Name.length + 1, value2.length - 1);
+
+  if (validator.isFunction(function1Value) || validator.isFunction(function2Value)) {
+    return function1Name === function2Name && areSameFunction(validator, function1Value, function2Value);
+  }
+  return function1Name === function2Name;
+}
+
+function backgroundPosition(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true)
+    && !(validator.isBackgroundPositionKeyword(value2) || validator.isGlobal(value2))) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  } if (validator.isBackgroundPositionKeyword(value2) || validator.isGlobal(value2)) {
+    return true;
+  }
+
+  return unit(validator, value1, value2);
+}
+
+function backgroundSize(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true)
+    && !(validator.isBackgroundSizeKeyword(value2) || validator.isGlobal(value2))) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  } if (validator.isBackgroundSizeKeyword(value2) || validator.isGlobal(value2)) {
+    return true;
+  }
+
+  return unit(validator, value1, value2);
+}
+
+function color(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isColor(value2)) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  } if (!validator.colorOpacity && (validator.isRgbColor(value1) || validator.isHslColor(value1))) {
+    return false;
+  } if (!validator.colorOpacity && (validator.isRgbColor(value2) || validator.isHslColor(value2))) {
+    return false;
+  } if (!validator.colorHexAlpha && (validator.isHexAlphaColor(value1) || validator.isHexAlphaColor(value2))) {
+    return false;
+  } if (validator.isColor(value1) && validator.isColor(value2)) {
+    return true;
+  }
+
+  return sameFunctionOrValue(validator, value1, value2);
+}
+
+function components(overrideCheckers) {
+  return function(validator, value1, value2, position) {
+    return overrideCheckers[position](validator, value1, value2);
+  };
+}
+
+function fontFamily(validator, value1, value2) {
+  return understandable(validator, value1, value2, 0, true);
+}
+
+function image(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isImage(value2)) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  } if (validator.isImage(value2)) {
+    return true;
+  } if (validator.isImage(value1)) {
+    return false;
+  }
+
+  return sameFunctionOrValue(validator, value1, value2);
+}
+
+function keyword(propertyName) {
+  return function(validator, value1, value2) {
+    if (!understandable(validator, value1, value2, 0, true) && !validator.isKeyword(propertyName)(value2)) {
+      return false;
+    } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+      return true;
+    }
+
+    return validator.isKeyword(propertyName)(value2);
+  };
+}
+
+function keywordWithGlobal(propertyName) {
+  return function(validator, value1, value2) {
+    if (!understandable(validator, value1, value2, 0, true)
+      && !(validator.isKeyword(propertyName)(value2) || validator.isGlobal(value2))) {
+      return false;
+    } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+      return true;
+    }
+
+    return validator.isKeyword(propertyName)(value2) || validator.isGlobal(value2);
+  };
+}
+
+function propertyName(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isIdentifier(value2)) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  }
+
+  return validator.isIdentifier(value2);
+}
+
+function sameFunctionOrValue(validator, value1, value2) {
+  return areSameFunction(validator, value1, value2)
+    ? true
+    : value1 === value2;
+}
+
+function textShadow(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true)
+    && !(validator.isUnit(value2)
+    || validator.isColor(value2)
+    || validator.isGlobal(value2))) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  }
+
+  return validator.isUnit(value2) || validator.isColor(value2) || validator.isGlobal(value2);
+}
+
+function time(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isTime(value2)) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  } if (validator.isTime(value1) && !validator.isTime(value2)) {
+    return false;
+  } if (validator.isTime(value2)) {
+    return true;
+  } if (validator.isTime(value1)) {
+    return false;
+  } if (validator.isFunction(value1)
+    && !validator.isPrefixed(value1)
+    && validator.isFunction(value2)
+    && !validator.isPrefixed(value2)) {
+    return true;
+  }
+
+  return sameFunctionOrValue(validator, value1, value2);
+}
+
+function timingFunction(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true)
+    && !(validator.isTimingFunction(value2) || validator.isGlobal(value2))) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  }
+
+  return validator.isTimingFunction(value2) || validator.isGlobal(value2);
+}
+
+function unit(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isUnit(value2)) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  } if (validator.isUnit(value1) && !validator.isUnit(value2)) {
+    return false;
+  } if (validator.isUnit(value2)) {
+    return true;
+  } if (validator.isUnit(value1)) {
+    return false;
+  } if (validator.isFunction(value1)
+    && !validator.isPrefixed(value1)
+    && validator.isFunction(value2)
+    && !validator.isPrefixed(value2)) {
+    return true;
+  }
+
+  return sameFunctionOrValue(validator, value1, value2);
+}
+
+function unitOrKeywordWithGlobal(propertyName) {
+  var byKeyword = keywordWithGlobal(propertyName);
+
+  return function(validator, value1, value2) {
+    return unit(validator, value1, value2) || byKeyword(validator, value1, value2);
+  };
+}
+
+function unitOrNumber(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true)
+    && !(validator.isUnit(value2)
+    || validator.isNumber(value2))) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  } if ((validator.isUnit(value1)
+    || validator.isNumber(value1))
+    && !(validator.isUnit(value2)
+    || validator.isNumber(value2))) {
+    return false;
+  } if (validator.isUnit(value2) || validator.isNumber(value2)) {
+    return true;
+  } if (validator.isUnit(value1) || validator.isNumber(value1)) {
+    return false;
+  } if (validator.isFunction(value1)
+    && !validator.isPrefixed(value1)
+    && validator.isFunction(value2)
+    && !validator.isPrefixed(value2)) {
+    return true;
+  }
+
+  return sameFunctionOrValue(validator, value1, value2);
+}
+
+function zIndex(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isZIndex(value2)) {
+    return false;
+  } if (validator.isVariable(value1) && validator.isVariable(value2)) {
+    return true;
+  }
+
+  return validator.isZIndex(value2);
+}
+
+module.exports = {
+  generic: {
+    color: color,
+    components: components,
+    image: image,
+    propertyName: propertyName,
+    time: time,
+    timingFunction: timingFunction,
+    unit: unit,
+    unitOrNumber: unitOrNumber
+  },
+  property: {
+    animationDirection: keywordWithGlobal('animation-direction'),
+    animationFillMode: keyword('animation-fill-mode'),
+    animationIterationCount: animationIterationCount,
+    animationName: animationName,
+    animationPlayState: keywordWithGlobal('animation-play-state'),
+    backgroundAttachment: keyword('background-attachment'),
+    backgroundClip: keywordWithGlobal('background-clip'),
+    backgroundOrigin: keyword('background-origin'),
+    backgroundPosition: backgroundPosition,
+    backgroundRepeat: keyword('background-repeat'),
+    backgroundSize: backgroundSize,
+    bottom: unitOrKeywordWithGlobal('bottom'),
+    borderCollapse: keyword('border-collapse'),
+    borderStyle: keywordWithGlobal('*-style'),
+    clear: keywordWithGlobal('clear'),
+    cursor: keywordWithGlobal('cursor'),
+    display: keywordWithGlobal('display'),
+    float: keywordWithGlobal('float'),
+    left: unitOrKeywordWithGlobal('left'),
+    fontFamily: fontFamily,
+    fontStretch: keywordWithGlobal('font-stretch'),
+    fontStyle: keywordWithGlobal('font-style'),
+    fontVariant: keywordWithGlobal('font-variant'),
+    fontWeight: keywordWithGlobal('font-weight'),
+    listStyleType: keywordWithGlobal('list-style-type'),
+    listStylePosition: keywordWithGlobal('list-style-position'),
+    outlineStyle: keywordWithGlobal('*-style'),
+    overflow: keywordWithGlobal('overflow'),
+    position: keywordWithGlobal('position'),
+    right: unitOrKeywordWithGlobal('right'),
+    textAlign: keywordWithGlobal('text-align'),
+    textDecoration: keywordWithGlobal('text-decoration'),
+    textOverflow: keywordWithGlobal('text-overflow'),
+    textShadow: textShadow,
+    top: unitOrKeywordWithGlobal('top'),
+    transform: sameFunctionOrValue,
+    verticalAlign: unitOrKeywordWithGlobal('vertical-align'),
+    visibility: keywordWithGlobal('visibility'),
+    whiteSpace: keywordWithGlobal('white-space'),
+    zIndex: zIndex
+  }
+};
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/properties/understandable.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/properties/understandable.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/properties/understandable.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,15 @@
+var sameVendorPrefixes = require('../../vendor-prefixes').same;
+
+function understandable(validator, value1, value2, _position, isPaired) {
+  if (!sameVendorPrefixes(value1, value2)) {
+    return false;
+  }
+
+  if (isPaired && validator.isVariable(value1) !== validator.isVariable(value2)) {
+    return false;
+  }
+
+  return true;
+}
+
+module.exports = understandable;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/restore.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/restore.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/configuration/restore.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,294 @@
+var shallowClone = require('../clone').shallow;
+
+var Token = require('../../tokenizer/token');
+var Marker = require('../../tokenizer/marker');
+
+function isInheritOnly(values) {
+  for (var i = 0, l = values.length; i < l; i++) {
+    var value = values[i][1];
+
+    if (value != 'inherit' && value != Marker.COMMA && value != Marker.FORWARD_SLASH) { return false; }
+  }
+
+  return true;
+}
+
+function background(property, configuration, lastInMultiplex) {
+  var components = property.components;
+  var restored = [];
+  var needsOne, needsBoth;
+
+  function restoreValue(component) {
+    Array.prototype.unshift.apply(restored, component.value);
+  }
+
+  function isDefaultValue(component) {
+    var descriptor = configuration[component.name];
+
+    if (descriptor.doubleValues && descriptor.defaultValue.length == 1) {
+      return component.value[0][1] == descriptor.defaultValue[0]
+        && (component.value[1]
+          ? component.value[1][1] == descriptor.defaultValue[0]
+          : true);
+    } if (descriptor.doubleValues && descriptor.defaultValue.length != 1) {
+      return component.value[0][1] == descriptor.defaultValue[0]
+      && ((component.value[1] ? component.value[1][1] : component.value[0][1])
+        == descriptor.defaultValue[1]);
+    }
+    return component.value[0][1] == descriptor.defaultValue;
+  }
+
+  for (var i = components.length - 1; i >= 0; i--) {
+    var component = components[i];
+    var isDefault = isDefaultValue(component);
+
+    if (component.name == 'background-clip') {
+      var originComponent = components[i - 1];
+      var isOriginDefault = isDefaultValue(originComponent);
+
+      needsOne = component.value[0][1] == originComponent.value[0][1];
+
+      needsBoth = !needsOne && (
+        (isOriginDefault && !isDefault)
+        || (!isOriginDefault && !isDefault)
+        || (!isOriginDefault && isDefault && component.value[0][1] != originComponent.value[0][1]));
+
+      if (needsOne) {
+        restoreValue(originComponent);
+      } else if (needsBoth) {
+        restoreValue(component);
+        restoreValue(originComponent);
+      }
+
+      i--;
+    } else if (component.name == 'background-size') {
+      var positionComponent = components[i - 1];
+      var isPositionDefault = isDefaultValue(positionComponent);
+
+      needsOne = !isPositionDefault && isDefault;
+
+      needsBoth = !needsOne
+        && (isPositionDefault && !isDefault || !isPositionDefault && !isDefault);
+
+      if (needsOne) {
+        restoreValue(positionComponent);
+      } else if (needsBoth) {
+        restoreValue(component);
+        restored.unshift([Token.PROPERTY_VALUE, Marker.FORWARD_SLASH]);
+        restoreValue(positionComponent);
+      } else if (positionComponent.value.length == 1) {
+        restoreValue(positionComponent);
+      }
+
+      i--;
+    } else {
+      if (isDefault || configuration[component.name].multiplexLastOnly && !lastInMultiplex) { continue; }
+
+      restoreValue(component);
+    }
+  }
+
+  if (restored.length === 0 && property.value.length == 1 && property.value[0][1] == '0') { restored.push(property.value[0]); }
+
+  if (restored.length === 0) { restored.push([Token.PROPERTY_VALUE, configuration[property.name].defaultValue]); }
+
+  if (isInheritOnly(restored)) { return [restored[0]]; }
+
+  return restored;
+}
+
+function borderRadius(property) {
+  if (property.multiplex) {
+    var horizontal = shallowClone(property);
+    var vertical = shallowClone(property);
+
+    for (var i = 0; i < 4; i++) {
+      var component = property.components[i];
+
+      var horizontalComponent = shallowClone(property);
+      horizontalComponent.value = [component.value[0]];
+      horizontal.components.push(horizontalComponent);
+
+      var verticalComponent = shallowClone(property);
+      // FIXME: only shorthand compactor (see breakup#borderRadius) knows that border radius
+      // longhands have two values, whereas tokenizer does not care about populating 2nd value
+      // if it's missing, hence this fallback
+      verticalComponent.value = [component.value[1] || component.value[0]];
+      vertical.components.push(verticalComponent);
+    }
+
+    var horizontalValues = fourValues(horizontal);
+    var verticalValues = fourValues(vertical);
+
+    if (horizontalValues.length == verticalValues.length
+        && horizontalValues[0][1] == verticalValues[0][1]
+        && (horizontalValues.length > 1 ? horizontalValues[1][1] == verticalValues[1][1] : true)
+        && (horizontalValues.length > 2 ? horizontalValues[2][1] == verticalValues[2][1] : true)
+        && (horizontalValues.length > 3 ? horizontalValues[3][1] == verticalValues[3][1] : true)) {
+      return horizontalValues;
+    }
+    return horizontalValues.concat([[Token.PROPERTY_VALUE, Marker.FORWARD_SLASH]]).concat(verticalValues);
+  }
+  return fourValues(property);
+}
+
+function font(property, configuration) {
+  var components = property.components;
+  var restored = [];
+  var component;
+  var componentIndex = 0;
+  var fontFamilyIndex = 0;
+
+  if (property.value[0][1].indexOf(Marker.INTERNAL) === 0) {
+    property.value[0][1] = property.value[0][1].substring(Marker.INTERNAL.length);
+    return property.value;
+  }
+
+  // first four components are optional
+  while (componentIndex < 4) {
+    component = components[componentIndex];
+
+    if (component.value[0][1] != configuration[component.name].defaultValue) {
+      Array.prototype.push.apply(restored, component.value);
+    }
+
+    componentIndex++;
+  }
+
+  // then comes font-size
+  Array.prototype.push.apply(restored, components[componentIndex].value);
+  componentIndex++;
+
+  // then may come line-height
+  if (components[componentIndex].value[0][1] != configuration[components[componentIndex].name].defaultValue) {
+    Array.prototype.push.apply(restored, [[Token.PROPERTY_VALUE, Marker.FORWARD_SLASH]]);
+    Array.prototype.push.apply(restored, components[componentIndex].value);
+  }
+
+  componentIndex++;
+
+  // then comes font-family
+  while (components[componentIndex].value[fontFamilyIndex]) {
+    restored.push(components[componentIndex].value[fontFamilyIndex]);
+
+    if (components[componentIndex].value[fontFamilyIndex + 1]) {
+      restored.push([Token.PROPERTY_VALUE, Marker.COMMA]);
+    }
+
+    fontFamilyIndex++;
+  }
+
+  if (isInheritOnly(restored)) {
+    return [restored[0]];
+  }
+
+  return restored;
+}
+
+function fourValues(property) {
+  var components = property.components;
+  var value1 = components[0].value[0];
+  var value2 = components[1].value[0];
+  var value3 = components[2].value[0];
+  var value4 = components[3].value[0];
+
+  if (value1[1] == value2[1] && value1[1] == value3[1] && value1[1] == value4[1]) {
+    return [value1];
+  } if (value1[1] == value3[1] && value2[1] == value4[1]) {
+    return [value1, value2];
+  } if (value2[1] == value4[1]) {
+    return [value1, value2, value3];
+  }
+  return [value1, value2, value3, value4];
+}
+
+function multiplex(restoreWith) {
+  return function(property, configuration) {
+    if (!property.multiplex) { return restoreWith(property, configuration, true); }
+
+    var multiplexSize = 0;
+    var restored = [];
+    var componentMultiplexSoFar = {};
+    var i, l;
+
+    // At this point we don't know what's the multiplex size, e.g. how many background layers are there
+    for (i = 0, l = property.components[0].value.length; i < l; i++) {
+      if (property.components[0].value[i][1] == Marker.COMMA) { multiplexSize++; }
+    }
+
+    for (i = 0; i <= multiplexSize; i++) {
+      var _property = shallowClone(property);
+
+      // We split multiplex into parts and restore them one by one
+      for (var j = 0, m = property.components.length; j < m; j++) {
+        var componentToClone = property.components[j];
+        var _component = shallowClone(componentToClone);
+        _property.components.push(_component);
+
+        // The trick is some properties has more than one value, so we iterate over values looking for
+        // a multiplex separator - a comma
+        for (var k = componentMultiplexSoFar[_component.name] || 0, n = componentToClone.value.length; k < n; k++) {
+          if (componentToClone.value[k][1] == Marker.COMMA) {
+            componentMultiplexSoFar[_component.name] = k + 1;
+            break;
+          }
+
+          _component.value.push(componentToClone.value[k]);
+        }
+      }
+
+      // No we can restore shorthand value
+      var lastInMultiplex = i == multiplexSize;
+      var _restored = restoreWith(_property, configuration, lastInMultiplex);
+      Array.prototype.push.apply(restored, _restored);
+
+      if (i < multiplexSize) { restored.push([Token.PROPERTY_VALUE, Marker.COMMA]); }
+    }
+
+    return restored;
+  };
+}
+
+function withoutDefaults(property, configuration) {
+  var components = property.components;
+  var restored = [];
+
+  for (var i = components.length - 1; i >= 0; i--) {
+    var component = components[i];
+    var descriptor = configuration[component.name];
+
+    if (component.value[0][1] != descriptor.defaultValue || ('keepUnlessDefault' in descriptor) && !isDefault(components, configuration, descriptor.keepUnlessDefault)) {
+      restored.unshift(component.value[0]);
+    }
+  }
+
+  if (restored.length === 0) { restored.push([Token.PROPERTY_VALUE, configuration[property.name].defaultValue]); }
+
+  if (isInheritOnly(restored)) { return [restored[0]]; }
+
+  return restored;
+}
+
+function isDefault(components, configuration, propertyName) {
+  var component;
+  var i, l;
+
+  for (i = 0, l = components.length; i < l; i++) {
+    component = components[i];
+
+    if (component.name == propertyName && component.value[0][1] == configuration[propertyName].defaultValue) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+module.exports = {
+  background: background,
+  borderRadius: borderRadius,
+  font: font,
+  fourValues: fourValues,
+  multiplex: multiplex,
+  withoutDefaults: withoutDefaults
+};
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/hack.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/hack.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/hack.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,8 @@
+var Hack = {
+  ASTERISK: 'asterisk',
+  BANG: 'bang',
+  BACKSLASH: 'backslash',
+  UNDERSCORE: 'underscore'
+};
+
+module.exports = Hack;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/invalid-property-error.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/invalid-property-error.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/invalid-property-error.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,10 @@
+function InvalidPropertyError(message) {
+  this.name = 'InvalidPropertyError';
+  this.message = message;
+  this.stack = (new Error()).stack;
+}
+
+InvalidPropertyError.prototype = Object.create(Error.prototype);
+InvalidPropertyError.prototype.constructor = InvalidPropertyError;
+
+module.exports = InvalidPropertyError;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-0/optimize.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-0/optimize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-0/optimize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,6 @@
+function level0Optimize(tokens) {
+  // noop as level 0 means no optimizations!
+  return tokens;
+}
+
+module.exports = level0Optimize;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/optimize.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/optimize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/optimize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,325 @@
+var sortSelectors = require('./sort-selectors');
+var tidyRules = require('./tidy-rules');
+var tidyBlock = require('./tidy-block');
+var tidyAtRule = require('./tidy-at-rule');
+
+var Hack = require('../hack');
+var removeUnused = require('../remove-unused');
+var restoreFromOptimizing = require('../restore-from-optimizing');
+var wrapForOptimizing = require('../wrap-for-optimizing').all;
+
+var configuration = require('../configuration');
+var optimizers = require('./value-optimizers');
+
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+
+var Token = require('../../tokenizer/token');
+var Marker = require('../../tokenizer/marker');
+
+var formatPosition = require('../../utils/format-position');
+
+var serializeRules = require('../../writer/one-time').rules;
+
+var CHARSET_TOKEN = '@charset';
+var CHARSET_REGEXP = new RegExp('^' + CHARSET_TOKEN, 'i');
+
+var DEFAULT_ROUNDING_PRECISION = require('../../options/rounding-precision').DEFAULT;
+
+var VARIABLE_PROPERTY_NAME_PATTERN = /^--\S+$/;
+var PROPERTY_NAME_PATTERN = /^(?:-chrome-|-[\w-]+\w|\w[\w-]+\w|\w{1,})$/;
+var IMPORT_PREFIX_PATTERN = /^@import/i;
+var URL_PREFIX_PATTERN = /^url\(/i;
+
+function startsAsUrl(value) {
+  return URL_PREFIX_PATTERN.test(value);
+}
+
+function isImport(token) {
+  return IMPORT_PREFIX_PATTERN.test(token[1]);
+}
+
+function isLegacyFilter(property) {
+  var value;
+
+  if (property.name == 'filter' || property.name == '-ms-filter') {
+    value = property.value[0][1];
+
+    return value.indexOf('progid') > -1
+      || value.indexOf('alpha') === 0
+      || value.indexOf('chroma') === 0;
+  }
+  return false;
+}
+
+function noop() {}
+
+function noopValueOptimizer(_name, value, _options) { return value; }
+
+function optimizeBody(rule, properties, context) {
+  var options = context.options;
+  var valueOptimizers;
+  var property, name, type, value;
+  var propertyToken;
+  var propertyOptimizer;
+  var serializedRule = serializeRules(rule);
+  var _properties = wrapForOptimizing(properties);
+  var pluginValueOptimizers = context.options.plugins.level1Value;
+  var pluginPropertyOptimizers = context.options.plugins.level1Property;
+  var isVariable;
+  var i, l;
+
+  for (i = 0, l = _properties.length; i < l; i++) {
+    var j, k, m, n;
+
+    property = _properties[i];
+    name = property.name;
+    propertyOptimizer = configuration[name] && configuration[name].propertyOptimizer || noop;
+    valueOptimizers = configuration[name] && configuration[name].valueOptimizers || [optimizers.whiteSpace];
+    isVariable = VARIABLE_PROPERTY_NAME_PATTERN.test(name);
+
+    if (isVariable) {
+      valueOptimizers = options.variableOptimizers.length > 0
+        ? options.variableOptimizers
+        : [optimizers.whiteSpace];
+    }
+
+    if (!isVariable && !PROPERTY_NAME_PATTERN.test(name)) {
+      propertyToken = property.all[property.position];
+      context.warnings.push('Invalid property name \'' + name + '\' at ' + formatPosition(propertyToken[1][2][0]) + '. Ignoring.');
+      property.unused = true;
+      continue;
+    }
+
+    if (property.value.length === 0) {
+      propertyToken = property.all[property.position];
+      context.warnings.push('Empty property \'' + name + '\' at ' + formatPosition(propertyToken[1][2][0]) + '. Ignoring.');
+      property.unused = true;
+      continue;
+    }
+
+    if (property.hack && (
+      (property.hack[0] == Hack.ASTERISK || property.hack[0] == Hack.UNDERSCORE)
+        && !options.compatibility.properties.iePrefixHack
+        || property.hack[0] == Hack.BACKSLASH && !options.compatibility.properties.ieSuffixHack
+        || property.hack[0] == Hack.BANG && !options.compatibility.properties.ieBangHack)) {
+      property.unused = true;
+      continue;
+    }
+
+    if (!options.compatibility.properties.ieFilters && isLegacyFilter(property)) {
+      property.unused = true;
+      continue;
+    }
+
+    if (property.block) {
+      optimizeBody(rule, property.value[0][1], context);
+      continue;
+    }
+
+    for (j = 0, m = property.value.length; j < m; j++) {
+      type = property.value[j][0];
+      value = property.value[j][1];
+
+      if (type == Token.PROPERTY_BLOCK) {
+        property.unused = true;
+        context.warnings.push('Invalid value token at ' + formatPosition(value[0][1][2][0]) + '. Ignoring.');
+        break;
+      }
+
+      if (startsAsUrl(value) && !context.validator.isUrl(value)) {
+        property.unused = true;
+        context.warnings.push('Broken URL \'' + value + '\' at ' + formatPosition(property.value[j][2][0]) + '. Ignoring.');
+        break;
+      }
+
+      for (k = 0, n = valueOptimizers.length; k < n; k++) {
+        value = valueOptimizers[k](name, value, options);
+      }
+
+      for (k = 0, n = pluginValueOptimizers.length; k < n; k++) {
+        value = pluginValueOptimizers[k](name, value, options);
+      }
+
+      property.value[j][1] = value;
+    }
+
+    propertyOptimizer(serializedRule, property, options);
+
+    for (j = 0, m = pluginPropertyOptimizers.length; j < m; j++) {
+      pluginPropertyOptimizers[j](serializedRule, property, options);
+    }
+  }
+
+  restoreFromOptimizing(_properties);
+  removeUnused(_properties);
+  removeComments(properties, options);
+}
+
+function removeComments(tokens, options) {
+  var token;
+  var i;
+
+  for (i = 0; i < tokens.length; i++) {
+    token = tokens[i];
+
+    if (token[0] != Token.COMMENT) {
+      continue;
+    }
+
+    optimizeComment(token, options);
+
+    if (token[1].length === 0) {
+      tokens.splice(i, 1);
+      i--;
+    }
+  }
+}
+
+function optimizeComment(token, options) {
+  if (token[1][2] == Marker.EXCLAMATION && (options.level[OptimizationLevel.One].specialComments == 'all' || options.commentsKept < options.level[OptimizationLevel.One].specialComments)) {
+    options.commentsKept++;
+    return;
+  }
+
+  token[1] = [];
+}
+
+function cleanupCharsets(tokens) {
+  var hasCharset = false;
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    if (token[0] != Token.AT_RULE) { continue; }
+
+    if (!CHARSET_REGEXP.test(token[1])) { continue; }
+
+    if (hasCharset || token[1].indexOf(CHARSET_TOKEN) == -1) {
+      tokens.splice(i, 1);
+      i--;
+      l--;
+    } else {
+      hasCharset = true;
+      tokens.splice(i, 1);
+      tokens.unshift([Token.AT_RULE, token[1].replace(CHARSET_REGEXP, CHARSET_TOKEN)]);
+    }
+  }
+}
+
+function buildUnitRegexp(options) {
+  var units = ['px', 'em', 'ex', 'cm', 'mm', 'in', 'pt', 'pc', '%'];
+  var otherUnits = ['ch', 'rem', 'vh', 'vm', 'vmax', 'vmin', 'vw'];
+
+  otherUnits.forEach(function(unit) {
+    if (options.compatibility.units[unit]) {
+      units.push(unit);
+    }
+  });
+
+  return new RegExp('(^|\\s|\\(|,)0(?:' + units.join('|') + ')(\\W|$)', 'g');
+}
+
+function buildPrecisionOptions(roundingPrecision) {
+  var precisionOptions = {
+    matcher: null,
+    units: {}
+  };
+  var optimizable = [];
+  var unit;
+  var value;
+
+  for (unit in roundingPrecision) {
+    value = roundingPrecision[unit];
+
+    if (value != DEFAULT_ROUNDING_PRECISION) {
+      precisionOptions.units[unit] = {};
+      precisionOptions.units[unit].value = value;
+      precisionOptions.units[unit].multiplier = 10 ** value;
+
+      optimizable.push(unit);
+    }
+  }
+
+  if (optimizable.length > 0) {
+    precisionOptions.enabled = true;
+    precisionOptions.decimalPointMatcher = new RegExp('(\\d)\\.($|' + optimizable.join('|') + ')($|\\W)', 'g');
+    precisionOptions.zeroMatcher = new RegExp('(\\d*)(\\.\\d+)(' + optimizable.join('|') + ')', 'g');
+  }
+
+  return precisionOptions;
+}
+
+function buildVariableOptimizers(options) {
+  return options.level[OptimizationLevel.One].variableValueOptimizers.map(function(optimizer) {
+    if (typeof (optimizer) == 'string') {
+      return optimizers[optimizer] || noopValueOptimizer;
+    }
+
+    return optimizer;
+  });
+}
+
+function level1Optimize(tokens, context) {
+  var options = context.options;
+  var levelOptions = options.level[OptimizationLevel.One];
+  var ie7Hack = options.compatibility.selectors.ie7Hack;
+  var adjacentSpace = options.compatibility.selectors.adjacentSpace;
+  var spaceAfterClosingBrace = options.compatibility.properties.spaceAfterClosingBrace;
+  var format = options.format;
+  var mayHaveCharset = false;
+  var afterRules = false;
+
+  options.unitsRegexp = options.unitsRegexp || buildUnitRegexp(options);
+  options.precision = options.precision || buildPrecisionOptions(levelOptions.roundingPrecision);
+  options.commentsKept = options.commentsKept || 0;
+  options.variableOptimizers = options.variableOptimizers || buildVariableOptimizers(options);
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    switch (token[0]) {
+    case Token.AT_RULE:
+      token[1] = isImport(token) && afterRules ? '' : token[1];
+      token[1] = levelOptions.tidyAtRules ? tidyAtRule(token[1]) : token[1];
+      mayHaveCharset = true;
+      break;
+    case Token.AT_RULE_BLOCK:
+      optimizeBody(token[1], token[2], context);
+      afterRules = true;
+      break;
+    case Token.NESTED_BLOCK:
+      token[1] = levelOptions.tidyBlockScopes ? tidyBlock(token[1], spaceAfterClosingBrace) : token[1];
+      level1Optimize(token[2], context);
+      afterRules = true;
+      break;
+    case Token.COMMENT:
+      optimizeComment(token, options);
+      break;
+    case Token.RULE:
+      token[1] = levelOptions.tidySelectors
+        ? tidyRules(token[1], !ie7Hack, adjacentSpace, format, context.warnings)
+        : token[1];
+      token[1] = token[1].length > 1 ? sortSelectors(token[1], levelOptions.selectorsSortingMethod) : token[1];
+      optimizeBody(token[1], token[2], context);
+      afterRules = true;
+      break;
+    }
+
+    if (token[0] == Token.COMMENT
+      && token[1].length === 0
+      || levelOptions.removeEmpty
+      && (token[1].length === 0 || (token[2] && token[2].length === 0))) {
+      tokens.splice(i, 1);
+      i--;
+      l--;
+    }
+  }
+
+  if (levelOptions.cleanupCharsets && mayHaveCharset) {
+    cleanupCharsets(tokens);
+  }
+
+  return tokens;
+}
+
+module.exports = level1Optimize;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,10 @@
+module.exports = {
+  background: require('./property-optimizers/background').level1.property,
+  boxShadow: require('./property-optimizers/box-shadow').level1.property,
+  borderRadius: require('./property-optimizers/border-radius').level1.property,
+  filter: require('./property-optimizers/filter').level1.property,
+  fontWeight: require('./property-optimizers/font-weight').level1.property,
+  margin: require('./property-optimizers/margin').level1.property,
+  outline: require('./property-optimizers/outline').level1.property,
+  padding: require('./property-optimizers/padding').level1.property
+};
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/background.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/background.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/background.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,23 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var plugin = {
+  level1: {
+    property: function background(_rule, property, options) {
+      var values = property.value;
+
+      if (!options.level[OptimizationLevel.One].optimizeBackground) {
+        return;
+      }
+
+      if (values.length == 1 && values[0][1] == 'none') {
+        values[0][1] = '0 0';
+      }
+
+      if (values.length == 1 && values[0][1] == 'transparent') {
+        values[0][1] = '0 0';
+      }
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/border-radius.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/border-radius.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/border-radius.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,29 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var plugin = {
+  level1: {
+    property: function borderRadius(_rule, property, options) {
+      var values = property.value;
+
+      if (!options.level[OptimizationLevel.One].optimizeBorderRadius) {
+        return;
+      }
+
+      if (values.length == 3 && values[1][1] == '/' && values[0][1] == values[2][1]) {
+        property.value.splice(1);
+        property.dirty = true;
+      } else if (values.length == 5 && values[2][1] == '/' && values[0][1] == values[3][1] && values[1][1] == values[4][1]) {
+        property.value.splice(2);
+        property.dirty = true;
+      } else if (values.length == 7 && values[3][1] == '/' && values[0][1] == values[4][1] && values[1][1] == values[5][1] && values[2][1] == values[6][1]) {
+        property.value.splice(3);
+        property.dirty = true;
+      } else if (values.length == 9 && values[4][1] == '/' && values[0][1] == values[5][1] && values[1][1] == values[6][1] && values[2][1] == values[7][1] && values[3][1] == values[8][1]) {
+        property.value.splice(4);
+        property.dirty = true;
+      }
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/box-shadow.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/box-shadow.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/box-shadow.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,15 @@
+var plugin = {
+  level1: {
+    property: function boxShadow(_rule, property) {
+      var values = property.value;
+
+      // remove multiple zeros
+      if (values.length == 4 && values[0][1] === '0' && values[1][1] === '0' && values[2][1] === '0' && values[3][1] === '0') {
+        property.value.splice(2);
+        property.dirty = true;
+      }
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/filter.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/filter.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/filter.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,34 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var ALPHA_OR_CHROMA_FILTER_PATTERN = /progid:DXImageTransform\.Microsoft\.(Alpha|Chroma)(\W)/;
+var NO_SPACE_AFTER_COMMA_PATTERN = /,(\S)/g;
+var WHITESPACE_AROUND_EQUALS_PATTERN = / ?= ?/g;
+
+var plugin = {
+  level1: {
+    property: function filter(_rule, property, options) {
+      if (!options.compatibility.properties.ieFilters) {
+        return;
+      }
+
+      if (!options.level[OptimizationLevel.One].optimizeFilter) {
+        return;
+      }
+
+      if (property.value.length == 1) {
+        property.value[0][1] = property.value[0][1].replace(
+          ALPHA_OR_CHROMA_FILTER_PATTERN,
+          function(match, filter, suffix) {
+            return filter.toLowerCase() + suffix;
+          }
+        );
+      }
+
+      property.value[0][1] = property.value[0][1]
+        .replace(NO_SPACE_AFTER_COMMA_PATTERN, ', $1')
+        .replace(WHITESPACE_AROUND_EQUALS_PATTERN, '=');
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/font-weight.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/font-weight.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/font-weight.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,23 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var plugin = {
+  level1: {
+    property: function fontWeight(_rule, property, options) {
+      var value = property.value[0][1];
+
+      if (!options.level[OptimizationLevel.One].optimizeFontWeight) {
+        return;
+      }
+
+      if (value == 'normal') {
+        value = '400';
+      } else if (value == 'bold') {
+        value = '700';
+      }
+
+      property.value[0][1] = value;
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/margin.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/margin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/margin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,21 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var plugin = {
+  level1: {
+    property: function margin(_rule, property, options) {
+      var values = property.value;
+
+      if (!options.level[OptimizationLevel.One].replaceMultipleZeros) {
+        return;
+      }
+
+      // remove multiple zeros
+      if (values.length == 4 && values[0][1] === '0' && values[1][1] === '0' && values[2][1] === '0' && values[3][1] === '0') {
+        property.value.splice(1);
+        property.dirty = true;
+      }
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/outline.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/outline.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/outline.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,19 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var plugin = {
+  level1: {
+    property: function outline(_rule, property, options) {
+      var values = property.value;
+
+      if (!options.level[OptimizationLevel.One].optimizeOutline) {
+        return;
+      }
+
+      if (values.length == 1 && values[0][1] == 'none') {
+        values[0][1] = '0';
+      }
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/padding.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/padding.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/padding.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,32 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+function isNegative(value) {
+  return value && value[1][0] == '-' && parseFloat(value[1]) < 0;
+}
+
+var plugin = {
+  level1: {
+    property: function padding(_rule, property, options) {
+      var values = property.value;
+
+      // remove multiple zeros
+      if (values.length == 4 && values[0][1] === '0' && values[1][1] === '0' && values[2][1] === '0' && values[3][1] === '0') {
+        property.value.splice(1);
+        property.dirty = true;
+      }
+
+      // remove negative paddings
+      if (options.level[OptimizationLevel.One].removeNegativePaddings
+        && (
+          isNegative(property.value[0])
+          || isNegative(property.value[1])
+          || isNegative(property.value[2])
+          || isNegative(property.value[3])
+        )) {
+        property.unused = true;
+      }
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/sort-selectors.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/sort-selectors.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/sort-selectors.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,23 @@
+var naturalCompare = require('../../utils/natural-compare');
+
+function naturalSorter(scope1, scope2) {
+  return naturalCompare(scope1[1], scope2[1]);
+}
+
+function standardSorter(scope1, scope2) {
+  return scope1[1] > scope2[1] ? 1 : -1;
+}
+
+function sortSelectors(selectors, method) {
+  switch (method) {
+  case 'natural':
+    return selectors.sort(naturalSorter);
+  case 'standard':
+    return selectors.sort(standardSorter);
+  case 'none':
+  case false:
+    return selectors;
+  }
+}
+
+module.exports = sortSelectors;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/tidy-at-rule.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/tidy-at-rule.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/tidy-at-rule.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,9 @@
+function tidyAtRule(value) {
+  return value
+    .replace(/\s+/g, ' ')
+    .replace(/url\(\s+/g, 'url(')
+    .replace(/\s+\)/g, ')')
+    .trim();
+}
+
+module.exports = tidyAtRule;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/tidy-block.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/tidy-block.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/tidy-block.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,34 @@
+var SUPPORTED_COMPACT_BLOCK_MATCHER = /^@media\W/;
+var SUPPORTED_QUOTE_REMOVAL_MATCHER = /^@(?:keyframes|-moz-keyframes|-o-keyframes|-webkit-keyframes)\W/;
+
+function tidyBlock(values, spaceAfterClosingBrace) {
+  var withoutSpaceAfterClosingBrace;
+  var withoutQuotes;
+  var i;
+
+  for (i = values.length - 1; i >= 0; i--) {
+    withoutSpaceAfterClosingBrace = !spaceAfterClosingBrace && SUPPORTED_COMPACT_BLOCK_MATCHER.test(values[i][1]);
+    withoutQuotes = SUPPORTED_QUOTE_REMOVAL_MATCHER.test(values[i][1]);
+
+    values[i][1] = values[i][1]
+      .replace(/\n|\r\n/g, ' ')
+      .replace(/\s+/g, ' ')
+      .replace(/(,|:|\() /g, '$1')
+      .replace(/ \)/g, ')');
+
+    if (withoutQuotes) {
+      values[i][1] = values[i][1]
+        .replace(/'([a-zA-Z][a-zA-Z\d\-_]+)'/, '$1')
+        .replace(/"([a-zA-Z][a-zA-Z\d\-_]+)"/, '$1');
+    }
+
+    if (withoutSpaceAfterClosingBrace) {
+      values[i][1] = values[i][1]
+        .replace(/\) /g, ')');
+    }
+  }
+
+  return values;
+}
+
+module.exports = tidyBlock;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/tidy-rules.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/tidy-rules.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/tidy-rules.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,265 @@
+var Spaces = require('../../options/format').Spaces;
+var Marker = require('../../tokenizer/marker');
+var formatPosition = require('../../utils/format-position');
+
+var CASE_ATTRIBUTE_PATTERN = /[\s"'][iI]\s*\]/;
+var CASE_RESTORE_PATTERN = /([\d\w])([iI])\]/g;
+var DOUBLE_QUOTE_CASE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"([iI])/g;
+var DOUBLE_QUOTE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"(\s|\])/g;
+var HTML_COMMENT_PATTERN = /^(?:(?:<!--|-->)\s*)+/;
+var SINGLE_QUOTE_CASE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'([iI])/g;
+var SINGLE_QUOTE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'(\s|\])/g;
+var RELATION_PATTERN = /[>+~]/;
+var WHITESPACE_PATTERN = /\s/;
+
+var ASTERISK_PLUS_HTML_HACK = '*+html ';
+var ASTERISK_FIRST_CHILD_PLUS_HTML_HACK = '*:first-child+html ';
+var LESS_THAN = '<';
+
+var PSEUDO_CLASSES_WITH_SELECTORS = [
+  ':current',
+  ':future',
+  ':has',
+  ':host',
+  ':host-context',
+  ':is',
+  ':not',
+  ':past',
+  ':where'
+];
+
+function hasInvalidCharacters(value) {
+  var isEscaped;
+  var isInvalid = false;
+  var character;
+  var isQuote = false;
+  var i, l;
+
+  for (i = 0, l = value.length; i < l; i++) {
+    character = value[i];
+
+    if (isEscaped) {
+      // continue as always
+    } else if (character == Marker.SINGLE_QUOTE || character == Marker.DOUBLE_QUOTE) {
+      isQuote = !isQuote;
+    } else if (!isQuote
+      && (character == Marker.CLOSE_CURLY_BRACKET
+        || character == Marker.EXCLAMATION
+        || character == LESS_THAN
+        || character == Marker.SEMICOLON)
+    ) {
+      isInvalid = true;
+      break;
+    } else if (!isQuote && i === 0 && RELATION_PATTERN.test(character)) {
+      isInvalid = true;
+      break;
+    }
+
+    isEscaped = character == Marker.BACK_SLASH;
+  }
+
+  return isInvalid;
+}
+
+function removeWhitespace(value, format) {
+  var stripped = [];
+  var character;
+  var isNewLineNix;
+  var isNewLineWin;
+  var isEscaped;
+  var wasEscaped;
+  var isQuoted;
+  var isSingleQuoted;
+  var isDoubleQuoted;
+  var isAttribute;
+  var isRelation;
+  var isWhitespace;
+  var isSpaceAwarePseudoClass;
+  var roundBracketLevel = 0;
+  var wasComma = false;
+  var wasRelation = false;
+  var wasWhitespace = false;
+  var withCaseAttribute = CASE_ATTRIBUTE_PATTERN.test(value);
+  var spaceAroundRelation = format && format.spaces[Spaces.AroundSelectorRelation];
+  var i, l;
+
+  for (i = 0, l = value.length; i < l; i++) {
+    character = value[i];
+
+    isNewLineNix = character == Marker.NEW_LINE_NIX;
+    isNewLineWin = character == Marker.NEW_LINE_NIX && value[i - 1] == Marker.CARRIAGE_RETURN;
+    isQuoted = isSingleQuoted || isDoubleQuoted;
+    isRelation = !isAttribute && !isEscaped && roundBracketLevel === 0 && RELATION_PATTERN.test(character);
+    isWhitespace = WHITESPACE_PATTERN.test(character);
+    isSpaceAwarePseudoClass = roundBracketLevel == 1 && character == Marker.CLOSE_ROUND_BRACKET
+      ? false
+      : isSpaceAwarePseudoClass
+        || (roundBracketLevel === 0 && character == Marker.COLON && isPseudoClassWithSelectors(value, i));
+
+    if (wasEscaped && isQuoted && isNewLineWin) {
+      // swallow escaped new windows lines in comments
+      stripped.pop();
+      stripped.pop();
+    } else if (isEscaped && isQuoted && isNewLineNix) {
+      // swallow escaped new *nix lines in comments
+      stripped.pop();
+    } else if (isEscaped) {
+      stripped.push(character);
+    } else if (character == Marker.OPEN_SQUARE_BRACKET && !isQuoted) {
+      stripped.push(character);
+      isAttribute = true;
+    } else if (character == Marker.CLOSE_SQUARE_BRACKET && !isQuoted) {
+      stripped.push(character);
+      isAttribute = false;
+    } else if (character == Marker.OPEN_ROUND_BRACKET && !isQuoted) {
+      stripped.push(character);
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && !isQuoted) {
+      stripped.push(character);
+      roundBracketLevel--;
+    } else if (character == Marker.SINGLE_QUOTE && !isQuoted) {
+      stripped.push(character);
+      isSingleQuoted = true;
+    } else if (character == Marker.DOUBLE_QUOTE && !isQuoted) {
+      stripped.push(character);
+      isDoubleQuoted = true;
+    } else if (character == Marker.SINGLE_QUOTE && isQuoted) {
+      stripped.push(character);
+      isSingleQuoted = false;
+    } else if (character == Marker.DOUBLE_QUOTE && isQuoted) {
+      stripped.push(character);
+      isDoubleQuoted = false;
+    } else if (isWhitespace && wasRelation && !spaceAroundRelation) {
+      continue;
+    } else if (!isWhitespace && wasRelation && spaceAroundRelation) {
+      stripped.push(Marker.SPACE);
+      stripped.push(character);
+    } else if (isWhitespace && !wasWhitespace && wasComma && roundBracketLevel > 0 && isSpaceAwarePseudoClass) {
+      // skip space
+    } else if (isWhitespace && !wasWhitespace && roundBracketLevel > 0 && isSpaceAwarePseudoClass) {
+      stripped.push(character);
+    } else if (isWhitespace && (isAttribute || roundBracketLevel > 0) && !isQuoted) {
+      // skip space
+    } else if (isWhitespace && wasWhitespace && !isQuoted) {
+      // skip extra space
+    } else if ((isNewLineWin || isNewLineNix) && (isAttribute || roundBracketLevel > 0) && isQuoted) {
+      // skip newline
+    } else if (isRelation && wasWhitespace && !spaceAroundRelation) {
+      stripped.pop();
+      stripped.push(character);
+    } else if (isRelation && !wasWhitespace && spaceAroundRelation) {
+      stripped.push(Marker.SPACE);
+      stripped.push(character);
+    } else if (isWhitespace) {
+      stripped.push(Marker.SPACE);
+    } else {
+      stripped.push(character);
+    }
+
+    wasEscaped = isEscaped;
+    isEscaped = character == Marker.BACK_SLASH;
+    wasRelation = isRelation;
+    wasWhitespace = isWhitespace;
+    wasComma = character == Marker.COMMA;
+  }
+
+  return withCaseAttribute
+    ? stripped.join('').replace(CASE_RESTORE_PATTERN, '$1 $2]')
+    : stripped.join('');
+}
+
+function isPseudoClassWithSelectors(value, colonPosition) {
+  var pseudoClass = value.substring(colonPosition, value.indexOf(Marker.OPEN_ROUND_BRACKET, colonPosition));
+
+  return PSEUDO_CLASSES_WITH_SELECTORS.indexOf(pseudoClass) > -1;
+}
+
+function removeQuotes(value) {
+  if (value.indexOf('\'') == -1 && value.indexOf('"') == -1) {
+    return value;
+  }
+
+  return value
+    .replace(SINGLE_QUOTE_CASE_PATTERN, '=$1 $2')
+    .replace(SINGLE_QUOTE_PATTERN, '=$1$2')
+    .replace(DOUBLE_QUOTE_CASE_PATTERN, '=$1 $2')
+    .replace(DOUBLE_QUOTE_PATTERN, '=$1$2');
+}
+
+function replacePseudoClasses(value) {
+  return value
+    .replace('nth-child(1)', 'first-child')
+    .replace('nth-of-type(1)', 'first-of-type')
+    .replace('nth-of-type(even)', 'nth-of-type(2n)')
+    .replace('nth-child(even)', 'nth-child(2n)')
+    .replace('nth-of-type(2n+1)', 'nth-of-type(odd)')
+    .replace('nth-child(2n+1)', 'nth-child(odd)')
+    .replace('nth-last-child(1)', 'last-child')
+    .replace('nth-last-of-type(1)', 'last-of-type')
+    .replace('nth-last-of-type(even)', 'nth-last-of-type(2n)')
+    .replace('nth-last-child(even)', 'nth-last-child(2n)')
+    .replace('nth-last-of-type(2n+1)', 'nth-last-of-type(odd)')
+    .replace('nth-last-child(2n+1)', 'nth-last-child(odd)');
+}
+
+function tidyRules(rules, removeUnsupported, adjacentSpace, format, warnings) {
+  var list = [];
+  var repeated = [];
+
+  function removeHTMLComment(rule, match) {
+    warnings.push('HTML comment \'' + match + '\' at ' + formatPosition(rule[2][0]) + '. Removing.');
+    return '';
+  }
+
+  for (var i = 0, l = rules.length; i < l; i++) {
+    var rule = rules[i];
+    var reduced = rule[1];
+
+    reduced = reduced.replace(HTML_COMMENT_PATTERN, removeHTMLComment.bind(null, rule));
+
+    if (hasInvalidCharacters(reduced)) {
+      warnings.push('Invalid selector \'' + rule[1] + '\' at ' + formatPosition(rule[2][0]) + '. Ignoring.');
+      continue;
+    }
+
+    reduced = removeWhitespace(reduced, format);
+    reduced = removeQuotes(reduced);
+
+    if (adjacentSpace && reduced.indexOf('nav') > 0) {
+      reduced = reduced.replace(/\+nav(\S|$)/, '+ nav$1');
+    }
+
+    if (removeUnsupported && reduced.indexOf(ASTERISK_PLUS_HTML_HACK) > -1) {
+      continue;
+    }
+
+    if (removeUnsupported && reduced.indexOf(ASTERISK_FIRST_CHILD_PLUS_HTML_HACK) > -1) {
+      continue;
+    }
+
+    if (reduced.indexOf('*') > -1) {
+      reduced = reduced
+        .replace(/\*([:#.[])/g, '$1')
+        .replace(/^(:first-child)?\+html/, '*$1+html');
+    }
+
+    if (repeated.indexOf(reduced) > -1) {
+      continue;
+    }
+
+    reduced = replacePseudoClasses(reduced);
+
+    rule[1] = reduced;
+    repeated.push(reduced);
+    list.push(rule);
+  }
+
+  if (list.length == 1 && list[0][1].length === 0) {
+    warnings.push('Empty selector \'' + list[0][1] + '\' at ' + formatPosition(list[0][2][0]) + '. Ignoring.');
+    list = [];
+  }
+
+  return list;
+}
+
+module.exports = tidyRules;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,14 @@
+module.exports = {
+  color: require('./value-optimizers/color').level1.value,
+  degrees: require('./value-optimizers/degrees').level1.value,
+  fraction: require('./value-optimizers/fraction').level1.value,
+  precision: require('./value-optimizers/precision').level1.value,
+  textQuotes: require('./value-optimizers/text-quotes').level1.value,
+  time: require('./value-optimizers/time').level1.value,
+  unit: require('./value-optimizers/unit').level1.value,
+  urlPrefix: require('./value-optimizers/url-prefix').level1.value,
+  urlQuotes: require('./value-optimizers/url-quotes').level1.value,
+  urlWhiteSpace: require('./value-optimizers/url-whitespace').level1.value,
+  whiteSpace: require('./value-optimizers/whitespace').level1.value,
+  zero: require('./value-optimizers/zero').level1.value
+};
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,89 @@
+var shortenHex = require('./color/shorten-hex');
+var shortenHsl = require('./color/shorten-hsl');
+var shortenRgb = require('./color/shorten-rgb');
+
+var split = require('../../../utils/split');
+
+var ANY_COLOR_FUNCTION_PATTERN = /(rgb|rgba|hsl|hsla)\(([^()]+)\)/gi;
+var COLOR_PREFIX_PATTERN = /#|rgb|hsl/gi;
+var HEX_LONG_PATTERN = /(^|[^='"])#([0-9a-f]{6})/gi;
+var HEX_SHORT_PATTERN = /(^|[^='"])#([0-9a-f]{3})/gi;
+var HEX_VALUE_PATTERN = /[0-9a-f]/i;
+var HSL_PATTERN = /hsl\((-?\d+),(-?\d+)%?,(-?\d+)%?\)/gi;
+var RGBA_HSLA_PATTERN = /(rgb|hsl)a?\((-?\d+),(-?\d+%?),(-?\d+%?),(0*[1-9]+[0-9]*(\.?\d*)?)\)/gi;
+var RGB_PATTERN = /rgb\((-?\d+),(-?\d+),(-?\d+)\)/gi;
+var TRANSPARENT_FUNCTION_PATTERN = /(?:rgba|hsla)\(0,0%?,0%?,0\)/g;
+
+var plugin = {
+  level1: {
+    value: function color(name, value, options) {
+      if (!options.compatibility.properties.colors) {
+        return value;
+      }
+
+      if (!value.match(COLOR_PREFIX_PATTERN)) {
+        return shortenHex(value);
+      }
+
+      value = value
+        .replace(RGBA_HSLA_PATTERN, function(match, colorFn, p1, p2, p3, alpha) {
+          return (parseInt(alpha) >= 1 ? colorFn + '(' + [p1, p2, p3].join(',') + ')' : match);
+        })
+        .replace(RGB_PATTERN, function(match, red, green, blue) {
+          return shortenRgb(red, green, blue);
+        })
+        .replace(HSL_PATTERN, function(match, hue, saturation, lightness) {
+          return shortenHsl(hue, saturation, lightness);
+        })
+        .replace(HEX_LONG_PATTERN, function(match, prefix, color, at, inputValue) {
+          var suffix = inputValue[at + match.length];
+
+          if (suffix && HEX_VALUE_PATTERN.test(suffix)) {
+            return match;
+          } if (color[0] == color[1] && color[2] == color[3] && color[4] == color[5]) {
+            return (prefix + '#' + color[0] + color[2] + color[4]).toLowerCase();
+          }
+          return (prefix + '#' + color).toLowerCase();
+        })
+        .replace(HEX_SHORT_PATTERN, function(match, prefix, color) {
+          return prefix + '#' + color.toLowerCase();
+        })
+        .replace(ANY_COLOR_FUNCTION_PATTERN, function(match, colorFunction, colorDef) {
+          var tokens = colorDef.split(',');
+          var colorFnLowercase = colorFunction && colorFunction.toLowerCase();
+          var applies = (colorFnLowercase == 'hsl' && tokens.length == 3)
+            || (colorFnLowercase == 'hsla' && tokens.length == 4)
+            || (colorFnLowercase == 'rgb' && tokens.length === 3 && colorDef.indexOf('%') > 0)
+            || (colorFnLowercase == 'rgba' && tokens.length == 4 && tokens[0].indexOf('%') > 0);
+
+          if (!applies) {
+            return match;
+          }
+
+          if (tokens[1].indexOf('%') == -1) {
+            tokens[1] += '%';
+          }
+
+          if (tokens[2].indexOf('%') == -1) {
+            tokens[2] += '%';
+          }
+
+          return colorFunction + '(' + tokens.join(',') + ')';
+        });
+
+      if (options.compatibility.colors.opacity && name.indexOf('background') == -1) {
+        value = value.replace(TRANSPARENT_FUNCTION_PATTERN, function(match) {
+          if (split(value, ',').pop().indexOf('gradient(') > -1) {
+            return match;
+          }
+
+          return 'transparent';
+        });
+      }
+
+      return shortenHex(value);
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color/shorten-hex.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color/shorten-hex.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color/shorten-hex.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,189 @@
+var COLORS = {
+  aliceblue: '#f0f8ff',
+  antiquewhite: '#faebd7',
+  aqua: '#0ff',
+  aquamarine: '#7fffd4',
+  azure: '#f0ffff',
+  beige: '#f5f5dc',
+  bisque: '#ffe4c4',
+  black: '#000',
+  blanchedalmond: '#ffebcd',
+  blue: '#00f',
+  blueviolet: '#8a2be2',
+  brown: '#a52a2a',
+  burlywood: '#deb887',
+  cadetblue: '#5f9ea0',
+  chartreuse: '#7fff00',
+  chocolate: '#d2691e',
+  coral: '#ff7f50',
+  cornflowerblue: '#6495ed',
+  cornsilk: '#fff8dc',
+  crimson: '#dc143c',
+  cyan: '#0ff',
+  darkblue: '#00008b',
+  darkcyan: '#008b8b',
+  darkgoldenrod: '#b8860b',
+  darkgray: '#a9a9a9',
+  darkgreen: '#006400',
+  darkgrey: '#a9a9a9',
+  darkkhaki: '#bdb76b',
+  darkmagenta: '#8b008b',
+  darkolivegreen: '#556b2f',
+  darkorange: '#ff8c00',
+  darkorchid: '#9932cc',
+  darkred: '#8b0000',
+  darksalmon: '#e9967a',
+  darkseagreen: '#8fbc8f',
+  darkslateblue: '#483d8b',
+  darkslategray: '#2f4f4f',
+  darkslategrey: '#2f4f4f',
+  darkturquoise: '#00ced1',
+  darkviolet: '#9400d3',
+  deeppink: '#ff1493',
+  deepskyblue: '#00bfff',
+  dimgray: '#696969',
+  dimgrey: '#696969',
+  dodgerblue: '#1e90ff',
+  firebrick: '#b22222',
+  floralwhite: '#fffaf0',
+  forestgreen: '#228b22',
+  fuchsia: '#f0f',
+  gainsboro: '#dcdcdc',
+  ghostwhite: '#f8f8ff',
+  gold: '#ffd700',
+  goldenrod: '#daa520',
+  gray: '#808080',
+  green: '#008000',
+  greenyellow: '#adff2f',
+  grey: '#808080',
+  honeydew: '#f0fff0',
+  hotpink: '#ff69b4',
+  indianred: '#cd5c5c',
+  indigo: '#4b0082',
+  ivory: '#fffff0',
+  khaki: '#f0e68c',
+  lavender: '#e6e6fa',
+  lavenderblush: '#fff0f5',
+  lawngreen: '#7cfc00',
+  lemonchiffon: '#fffacd',
+  lightblue: '#add8e6',
+  lightcoral: '#f08080',
+  lightcyan: '#e0ffff',
+  lightgoldenrodyellow: '#fafad2',
+  lightgray: '#d3d3d3',
+  lightgreen: '#90ee90',
+  lightgrey: '#d3d3d3',
+  lightpink: '#ffb6c1',
+  lightsalmon: '#ffa07a',
+  lightseagreen: '#20b2aa',
+  lightskyblue: '#87cefa',
+  lightslategray: '#778899',
+  lightslategrey: '#778899',
+  lightsteelblue: '#b0c4de',
+  lightyellow: '#ffffe0',
+  lime: '#0f0',
+  limegreen: '#32cd32',
+  linen: '#faf0e6',
+  magenta: '#ff00ff',
+  maroon: '#800000',
+  mediumaquamarine: '#66cdaa',
+  mediumblue: '#0000cd',
+  mediumorchid: '#ba55d3',
+  mediumpurple: '#9370db',
+  mediumseagreen: '#3cb371',
+  mediumslateblue: '#7b68ee',
+  mediumspringgreen: '#00fa9a',
+  mediumturquoise: '#48d1cc',
+  mediumvioletred: '#c71585',
+  midnightblue: '#191970',
+  mintcream: '#f5fffa',
+  mistyrose: '#ffe4e1',
+  moccasin: '#ffe4b5',
+  navajowhite: '#ffdead',
+  navy: '#000080',
+  oldlace: '#fdf5e6',
+  olive: '#808000',
+  olivedrab: '#6b8e23',
+  orange: '#ffa500',
+  orangered: '#ff4500',
+  orchid: '#da70d6',
+  palegoldenrod: '#eee8aa',
+  palegreen: '#98fb98',
+  paleturquoise: '#afeeee',
+  palevioletred: '#db7093',
+  papayawhip: '#ffefd5',
+  peachpuff: '#ffdab9',
+  peru: '#cd853f',
+  pink: '#ffc0cb',
+  plum: '#dda0dd',
+  powderblue: '#b0e0e6',
+  purple: '#800080',
+  rebeccapurple: '#663399',
+  red: '#f00',
+  rosybrown: '#bc8f8f',
+  royalblue: '#4169e1',
+  saddlebrown: '#8b4513',
+  salmon: '#fa8072',
+  sandybrown: '#f4a460',
+  seagreen: '#2e8b57',
+  seashell: '#fff5ee',
+  sienna: '#a0522d',
+  silver: '#c0c0c0',
+  skyblue: '#87ceeb',
+  slateblue: '#6a5acd',
+  slategray: '#708090',
+  slategrey: '#708090',
+  snow: '#fffafa',
+  springgreen: '#00ff7f',
+  steelblue: '#4682b4',
+  tan: '#d2b48c',
+  teal: '#008080',
+  thistle: '#d8bfd8',
+  tomato: '#ff6347',
+  turquoise: '#40e0d0',
+  violet: '#ee82ee',
+  wheat: '#f5deb3',
+  white: '#fff',
+  whitesmoke: '#f5f5f5',
+  yellow: '#ff0',
+  yellowgreen: '#9acd32'
+};
+
+var toHex = {};
+var toName = {};
+
+for (var name in COLORS) {
+  var hex = COLORS[name];
+
+  if (name.length < hex.length) {
+    toName[hex] = name;
+  } else {
+    toHex[name] = hex;
+  }
+}
+
+var toHexPattern = new RegExp('(^| |,|\\))(' + Object.keys(toHex).join('|') + ')( |,|\\)|$)', 'ig');
+var toNamePattern = new RegExp('(' + Object.keys(toName).join('|') + ')([^a-f0-9]|$)', 'ig');
+
+function hexConverter(match, prefix, colorValue, suffix) {
+  return prefix + toHex[colorValue.toLowerCase()] + suffix;
+}
+
+function nameConverter(match, colorValue, suffix) {
+  return toName[colorValue.toLowerCase()] + suffix;
+}
+
+function shortenHex(value) {
+  var hasHex = value.indexOf('#') > -1;
+  var shortened = value.replace(toHexPattern, hexConverter);
+
+  if (shortened != value) {
+    shortened = shortened.replace(toHexPattern, hexConverter);
+  }
+
+  return hasHex
+    ? shortened.replace(toNamePattern, nameConverter)
+    : shortened;
+}
+
+module.exports = shortenHex;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color/shorten-hsl.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color/shorten-hsl.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color/shorten-hsl.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,54 @@
+// HSL to RGB converter. Both methods adapted from:
+// http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
+
+function hslToRgb(h, s, l) {
+  var r, g, b;
+
+  // normalize hue orientation b/w 0 and 360 degrees
+  h %= 360;
+  if (h < 0) { h += 360; }
+  h = ~~h / 360;
+
+  if (s < 0) { s = 0; } else if (s > 100) { s = 100; }
+  s = ~~s / 100;
+
+  if (l < 0) { l = 0; } else if (l > 100) { l = 100; }
+  l = ~~l / 100;
+
+  if (s === 0) {
+    r = g = b = l; // achromatic
+  } else {
+    var q = l < 0.5
+      ? l * (1 + s)
+      : l + s - l * s;
+    var p = 2 * l - q;
+    r = hueToRgb(p, q, h + 1 / 3);
+    g = hueToRgb(p, q, h);
+    b = hueToRgb(p, q, h - 1 / 3);
+  }
+
+  return [~~(r * 255), ~~(g * 255), ~~(b * 255)];
+}
+
+function hueToRgb(p, q, t) {
+  if (t < 0) { t += 1; }
+  if (t > 1) { t -= 1; }
+  if (t < 1 / 6) { return p + (q - p) * 6 * t; }
+  if (t < 1 / 2) { return q; }
+  if (t < 2 / 3) { return p + (q - p) * (2 / 3 - t) * 6; }
+  return p;
+}
+
+function shortenHsl(hue, saturation, lightness) {
+  var asRgb = hslToRgb(hue, saturation, lightness);
+  var redAsHex = asRgb[0].toString(16);
+  var greenAsHex = asRgb[1].toString(16);
+  var blueAsHex = asRgb[2].toString(16);
+
+  return '#'
+    + ((redAsHex.length == 1 ? '0' : '') + redAsHex)
+    + ((greenAsHex.length == 1 ? '0' : '') + greenAsHex)
+    + ((blueAsHex.length == 1 ? '0' : '') + blueAsHex);
+}
+
+module.exports = shortenHsl;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color/shorten-rgb.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color/shorten-rgb.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/color/shorten-rgb.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,10 @@
+function shortenRgb(red, green, blue) {
+  var normalizedRed = Math.max(0, Math.min(parseInt(red), 255));
+  var normalizedGreen = Math.max(0, Math.min(parseInt(green), 255));
+  var normalizedBlue = Math.max(0, Math.min(parseInt(blue), 255));
+
+  // Credit: Asen  http://jsbin.com/UPUmaGOc/2/edit?js,console
+  return '#' + ('00000' + (normalizedRed << 16 | normalizedGreen << 8 | normalizedBlue).toString(16)).slice(-6);
+}
+
+module.exports = shortenRgb;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/degrees.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/degrees.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/degrees.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,19 @@
+var ZERO_DEG_PATTERN = /\(0deg\)/g;
+
+var plugin = {
+  level1: {
+    value: function degrees(_name, value, options) {
+      if (!options.compatibility.properties.zeroUnits) {
+        return value;
+      }
+
+      if (value.indexOf('0deg') == -1) {
+        return value;
+      }
+
+      return value.replace(ZERO_DEG_PATTERN, '(0)');
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/fraction.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/fraction.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/fraction.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,72 @@
+var split = require('../../../utils/split');
+var startsAsUrl = require('./starts-as-url');
+
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var EXPRESSION_PATTERN = /^expression\(.*\)$/;
+var ANY_FUNCTION_PATTERN = /^(-(?:moz|ms|o|webkit)-[a-z-]+|[a-z-]+)\((.+)\)$/;
+var TOKEN_SEPARATOR_PATTERN = /([\s,/])/;
+
+var DOT_ZERO_PATTERN = /(^|\D)\.0+(\D|$)/g;
+var FRACTION_PATTERN = /\.([1-9]*)0+(\D|$)/g;
+var LEADING_ZERO_FRACTION_PATTERN = /(^|\D)0\.(\d)/g;
+var MINUS_ZERO_FRACTION_PATTERN = /([^\w\d-]|^)-0([^.]|$)/g;
+var ZERO_PREFIXED_UNIT_PATTERN = /(^|\s)0+([1-9])/g;
+
+function optimizeRecursively(value) {
+  var functionTokens;
+  var tokens;
+
+  if (startsAsUrl(value)) {
+    return value;
+  }
+
+  if (EXPRESSION_PATTERN.test(value)) {
+    return value;
+  }
+
+  functionTokens = ANY_FUNCTION_PATTERN.exec(value);
+
+  if (!functionTokens) {
+    return optimizeFractions(value);
+  }
+
+  tokens = split(functionTokens[2], TOKEN_SEPARATOR_PATTERN)
+    .map(function(token) { return optimizeRecursively(token); });
+
+  return functionTokens[1] + '(' + tokens.join('') + ')';
+}
+
+function optimizeFractions(value) {
+  if (value.indexOf('0') == -1) {
+    return value;
+  }
+
+  if (value.indexOf('-') > -1) {
+    value = value
+      .replace(MINUS_ZERO_FRACTION_PATTERN, '$10$2')
+      .replace(MINUS_ZERO_FRACTION_PATTERN, '$10$2');
+  }
+
+  return value
+    .replace(ZERO_PREFIXED_UNIT_PATTERN, '$1$2')
+    .replace(DOT_ZERO_PATTERN, '$10$2')
+    .replace(FRACTION_PATTERN, function(match, nonZeroPart, suffix) {
+      return (nonZeroPart.length > 0 ? '.' : '') + nonZeroPart + suffix;
+    })
+    .replace(LEADING_ZERO_FRACTION_PATTERN, '$1.$2');
+}
+
+var plugin = {
+  level1: {
+    value: function fraction(name, value, options) {
+      if (!options.level[OptimizationLevel.One].replaceZeroUnits) {
+        return value;
+      }
+
+      return optimizeRecursively(value);
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/precision.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/precision.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/precision.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,22 @@
+var plugin = {
+  level1: {
+    value: function precision(_name, value, options) {
+      if (!options.precision.enabled || value.indexOf('.') === -1) {
+        return value;
+      }
+
+      return value
+        .replace(options.precision.decimalPointMatcher, '$1$2$3')
+        .replace(options.precision.zeroMatcher, function(match, integerPart, fractionPart, unit) {
+          var multiplier = options.precision.units[unit].multiplier;
+          var parsedInteger = parseInt(integerPart);
+          var integer = Number.isNaN(parsedInteger) ? 0 : parsedInteger;
+          var fraction = parseFloat(fractionPart);
+
+          return Math.round((integer + fraction) * multiplier) / multiplier + unit;
+        });
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/starts-as-url.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/starts-as-url.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/starts-as-url.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var URL_PREFIX_PATTERN = /^url\(/i;
+
+function startsAsUrl(value) {
+  return URL_PREFIX_PATTERN.test(value);
+}
+
+module.exports = startsAsUrl;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/text-quotes.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/text-quotes.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/text-quotes.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,31 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var LOCAL_PREFIX_PATTERN = /^local\(/i;
+var QUOTED_PATTERN = /^('.*'|".*")$/;
+var QUOTED_BUT_SAFE_PATTERN = /^['"][a-zA-Z][a-zA-Z\d\-_]+['"]$/;
+// eslint-disable-next-line max-len
+var GENERIC_FONT_FAMILY_PATTERN = /^['"](?:cursive|default|emoji|fangsong|fantasy|inherit|initial|math|monospace|revert|revert-layer|sans-serif|serif|system-ui|ui-monospace|ui-rounded|ui-sans-serif|ui-serif|unset)['"]$/;
+
+var plugin = {
+  level1: {
+    value: function textQuotes(name, value, options) {
+      if ((name == 'font-family' || name == 'font') && GENERIC_FONT_FAMILY_PATTERN.test(value)) {
+        return value;
+      }
+
+      if (!options.level[OptimizationLevel.One].removeQuotes) {
+        return value;
+      }
+
+      if (!QUOTED_PATTERN.test(value) && !LOCAL_PREFIX_PATTERN.test(value)) {
+        return value;
+      }
+
+      return QUOTED_BUT_SAFE_PATTERN.test(value)
+        ? value.substring(1, value.length - 1)
+        : value;
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/time.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/time.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/time.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,31 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var TIME_VALUE = /^(-?[\d.]+)(m?s)$/;
+
+var plugin = {
+  level1: {
+    value: function time(name, value, options) {
+      if (!options.level[OptimizationLevel.One].replaceTimeUnits) {
+        return value;
+      }
+
+      if (!TIME_VALUE.test(value)) {
+        return value;
+      }
+
+      return value.replace(TIME_VALUE, function(match, val, unit) {
+        var newValue;
+
+        if (unit == 'ms') {
+          newValue = parseInt(val) / 1000 + 's';
+        } else if (unit == 's') {
+          newValue = parseFloat(val) * 1000 + 'ms';
+        }
+
+        return newValue.length < match.length ? newValue : match;
+      });
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/unit.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/unit.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/unit.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,46 @@
+var WHOLE_PIXEL_VALUE = /(?:^|\s|\()(-?\d+)px/;
+
+var plugin = {
+  level1: {
+    value: function unit(_name, value, options) {
+      if (!WHOLE_PIXEL_VALUE.test(value)) {
+        return value;
+      }
+
+      return value.replace(WHOLE_PIXEL_VALUE, function(match, val) {
+        var newValue;
+        var intVal = parseInt(val);
+
+        if (intVal === 0) {
+          return match;
+        }
+
+        if (options.compatibility.properties.shorterLengthUnits
+          && options.compatibility.units.pt
+          && intVal * 3 % 4 === 0) {
+          newValue = intVal * 3 / 4 + 'pt';
+        }
+
+        if (options.compatibility.properties.shorterLengthUnits
+          && options.compatibility.units.pc
+          && intVal % 16 === 0) {
+          newValue = intVal / 16 + 'pc';
+        }
+
+        if (options.compatibility.properties.shorterLengthUnits
+          && options.compatibility.units.in
+          && intVal % 96 === 0) {
+          newValue = intVal / 96 + 'in';
+        }
+
+        if (newValue) {
+          newValue = match.substring(0, match.indexOf(val)) + newValue;
+        }
+
+        return newValue && newValue.length < match.length ? newValue : match;
+      });
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-prefix.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-prefix.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-prefix.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,23 @@
+var startsAsUrl = require('./starts-as-url');
+
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var URL_PREFIX_PATTERN = /^url\(/i;
+
+var plugin = {
+  level1: {
+    value: function urlPrefix(_name, value, options) {
+      if (!options.level[OptimizationLevel.One].normalizeUrls) {
+        return value;
+      }
+
+      if (!startsAsUrl(value)) {
+        return value;
+      }
+
+      return value.replace(URL_PREFIX_PATTERN, 'url(');
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-quotes.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-quotes.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-quotes.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,22 @@
+var QUOTED_URL_PATTERN = /^url\(['"].+['"]\)$/;
+var QUOTED_URL_WITH_WHITESPACE_PATTERN = /^url\(['"].*[*\s()'"].*['"]\)$/;
+var QUOTES_PATTERN = /["']/g;
+var URL_DATA_PATTERN = /^url\(['"]data:[^;]+;charset/;
+
+var plugin = {
+  level1: {
+    value: function urlQuotes(_name, value, options) {
+      if (options.compatibility.properties.urlQuotes) {
+        return value;
+      }
+
+      return QUOTED_URL_PATTERN.test(value)
+        && !QUOTED_URL_WITH_WHITESPACE_PATTERN.test(value)
+        && !URL_DATA_PATTERN.test(value)
+        ? value.replace(QUOTES_PATTERN, '')
+        : value;
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-whitespace.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-whitespace.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-whitespace.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,22 @@
+var startsAsUrl = require('./starts-as-url');
+
+var WHITESPACE_PATTERN = /\\?\n|\\?\r\n/g;
+var WHITESPACE_PREFIX_PATTERN = /(\()\s+/g;
+var WHITESPACE_SUFFIX_PATTERN = /\s+(\))/g;
+
+var plugin = {
+  level1: {
+    value: function urlWhitespace(_name, value) {
+      if (!startsAsUrl(value)) {
+        return value;
+      }
+
+      return value
+        .replace(WHITESPACE_PATTERN, '')
+        .replace(WHITESPACE_PREFIX_PATTERN, '$1')
+        .replace(WHITESPACE_SUFFIX_PATTERN, '$1');
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/whitespace.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/whitespace.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/whitespace.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,48 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var Marker = require('../../../tokenizer/marker');
+
+var CALC_DIVISION_WHITESPACE_PATTERN = /\) ?\/ ?/g;
+var COMMA_AND_SPACE_PATTERN = /, /g;
+var LINE_BREAK_PATTERN = /\r?\n/g;
+var MULTI_WHITESPACE_PATTERN = /\s+/g;
+var FUNCTION_CLOSING_BRACE_WHITESPACE_PATTERN = /\s+(;?\))/g;
+var FUNCTION_OPENING_BRACE_WHITESPACE_PATTERN = /(\(;?)\s+/g;
+var VARIABLE_NAME_PATTERN = /^--\S+$/;
+var VARIABLE_VALUE_PATTERN = /^var\(\s*--\S+\s*\)$/;
+
+var plugin = {
+  level1: {
+    value: function whitespace(name, value, options) {
+      if (!options.level[OptimizationLevel.One].removeWhitespace) {
+        return value;
+      }
+
+      if (VARIABLE_NAME_PATTERN.test(name) && !VARIABLE_VALUE_PATTERN.test(value)) {
+        return value;
+      }
+
+      if ((value.indexOf(' ') == -1 && value.indexOf('\n') == -1) || value.indexOf('expression') === 0) {
+        return value;
+      }
+
+      if (value.indexOf(Marker.SINGLE_QUOTE) > -1 || value.indexOf(Marker.DOUBLE_QUOTE) > -1) {
+        return value;
+      }
+
+      value = value.replace(LINE_BREAK_PATTERN, '');
+      value = value.replace(MULTI_WHITESPACE_PATTERN, ' ');
+
+      if (value.indexOf('calc') > -1) {
+        value = value.replace(CALC_DIVISION_WHITESPACE_PATTERN, ')/ ');
+      }
+
+      return value
+        .replace(FUNCTION_OPENING_BRACE_WHITESPACE_PATTERN, '$1')
+        .replace(FUNCTION_CLOSING_BRACE_WHITESPACE_PATTERN, '$1')
+        .replace(COMMA_AND_SPACE_PATTERN, ',');
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/zero.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/zero.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-1/value-optimizers/zero.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,49 @@
+var split = require('../../../utils/split');
+
+var ANY_FUNCTION_PATTERN = /^(-(?:moz|ms|o|webkit)-[a-z-]+|[a-z-]+)\((.+)\)$/;
+var SKIP_FUNCTION_PATTERN = /^(?:-moz-calc|-webkit-calc|calc|rgb|hsl|rgba|hsla|min|max|clamp|expression)\(/;
+var TOKEN_SEPARATOR_PATTERN = /([\s,/])/;
+
+function removeRecursively(value, options) {
+  var functionTokens;
+  var tokens;
+
+  if (SKIP_FUNCTION_PATTERN.test(value)) {
+    return value;
+  }
+
+  functionTokens = ANY_FUNCTION_PATTERN.exec(value);
+
+  if (!functionTokens) {
+    return removeZeros(value, options);
+  }
+
+  tokens = split(functionTokens[2], TOKEN_SEPARATOR_PATTERN)
+    .map(function(token) { return removeRecursively(token, options); });
+
+  return functionTokens[1] + '(' + tokens.join('') + ')';
+}
+
+function removeZeros(value, options) {
+  return value
+    .replace(options.unitsRegexp, '$10$2')
+    .replace(options.unitsRegexp, '$10$2');
+}
+
+var plugin = {
+  level1: {
+    value: function zero(name, value, options) {
+      if (!options.compatibility.properties.zeroUnits) {
+        return value;
+      }
+
+      if (value.indexOf('%') > 0 && (name == 'height' || name == 'max-height' || name == 'width' || name == 'max-width')) {
+        return value;
+      }
+
+      return removeRecursively(value, options);
+    }
+  }
+};
+
+module.exports = plugin;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/extract-properties.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/extract-properties.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/extract-properties.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,61 @@
+// This extractor is used in level 2 optimizations
+// IMPORTANT: Mind Token class and this code is not related!
+// Properties will be tokenized in one step, see #429
+
+var Token = require('../../tokenizer/token');
+var serializeRules = require('../../writer/one-time').rules;
+var serializeValue = require('../../writer/one-time').value;
+
+function extractProperties(token) {
+  var properties = [];
+  var inSpecificSelector;
+  var property;
+  var name;
+  var value;
+  var i, l;
+
+  if (token[0] == Token.RULE) {
+    inSpecificSelector = !/[.+>~]/.test(serializeRules(token[1]));
+
+    for (i = 0, l = token[2].length; i < l; i++) {
+      property = token[2][i];
+
+      if (property[0] != Token.PROPERTY) { continue; }
+
+      name = property[1][1];
+      if (name.length === 0) { continue; }
+
+      value = serializeValue(property, i);
+
+      properties.push([
+        name,
+        value,
+        findNameRoot(name),
+        token[2][i],
+        name + ':' + value,
+        token[1],
+        inSpecificSelector
+      ]);
+    }
+  } else if (token[0] == Token.NESTED_BLOCK) {
+    for (i = 0, l = token[2].length; i < l; i++) {
+      properties = properties.concat(extractProperties(token[2][i]));
+    }
+  }
+
+  return properties;
+}
+
+function findNameRoot(name) {
+  if (name == 'list-style') { return name; }
+  if (name.indexOf('-radius') > 0) { return 'border-radius'; }
+  if (name == 'border-collapse' || name == 'border-spacing' || name == 'border-image') { return name; }
+  if (name.indexOf('border-') === 0 && /^border-\w+-\w+$/.test(name)) { return name.match(/border-\w+/)[0]; }
+  if (name.indexOf('border-') === 0 && /^border-\w+$/.test(name)) { return 'border'; }
+  if (name.indexOf('text-') === 0) { return name; }
+  if (name == '-chrome-') { return name; }
+
+  return name.replace(/^-\w+-/, '').match(/([a-zA-Z]+)/)[0].toLowerCase();
+}
+
+module.exports = extractProperties;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/is-mergeable.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/is-mergeable.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/is-mergeable.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,273 @@
+var Marker = require('../../tokenizer/marker');
+var split = require('../../utils/split');
+
+var DEEP_SELECTOR_PATTERN = /\/deep\//;
+var DOUBLE_COLON_PATTERN = /^::/;
+var VENDOR_PREFIXED_PATTERN = /:(-moz-|-ms-|-o-|-webkit-)/;
+
+var NOT_PSEUDO = ':not';
+var PSEUDO_CLASSES_WITH_ARGUMENTS = [
+  ':dir',
+  ':lang',
+  ':not',
+  ':nth-child',
+  ':nth-last-child',
+  ':nth-last-of-type',
+  ':nth-of-type'
+];
+var RELATION_PATTERN = /[>+~]/;
+var UNMIXABLE_PSEUDO_CLASSES = [
+  ':after',
+  ':before',
+  ':first-letter',
+  ':first-line',
+  ':lang'
+];
+var UNMIXABLE_PSEUDO_ELEMENTS = [
+  '::after',
+  '::before',
+  '::first-letter',
+  '::first-line'
+];
+
+var Level = {
+  DOUBLE_QUOTE: 'double-quote',
+  SINGLE_QUOTE: 'single-quote',
+  ROOT: 'root'
+};
+
+function isMergeable(selector, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) {
+  var singleSelectors = split(selector, Marker.COMMA);
+  var singleSelector;
+  var i, l;
+
+  for (i = 0, l = singleSelectors.length; i < l; i++) {
+    singleSelector = singleSelectors[i];
+
+    if (singleSelector.length === 0
+        || isDeepSelector(singleSelector)
+        || isVendorPrefixed(singleSelector)
+        || (singleSelector.indexOf(Marker.COLON) > -1
+          && !areMergeable(
+            singleSelector,
+            extractPseudoFrom(singleSelector),
+            mergeablePseudoClasses,
+            mergeablePseudoElements,
+            multiplePseudoMerging
+          ))) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function isDeepSelector(selector) {
+  return DEEP_SELECTOR_PATTERN.test(selector);
+}
+
+function isVendorPrefixed(selector) {
+  return VENDOR_PREFIXED_PATTERN.test(selector);
+}
+
+function extractPseudoFrom(selector) {
+  var list = [];
+  var character;
+  var buffer = [];
+  var level = Level.ROOT;
+  var roundBracketLevel = 0;
+  var isQuoted;
+  var isEscaped;
+  var isPseudo = false;
+  var isRelation;
+  var wasColon = false;
+  var index;
+  var len;
+
+  for (index = 0, len = selector.length; index < len; index++) {
+    character = selector[index];
+
+    isRelation = !isEscaped && RELATION_PATTERN.test(character);
+    isQuoted = level == Level.DOUBLE_QUOTE || level == Level.SINGLE_QUOTE;
+
+    if (isEscaped) {
+      buffer.push(character);
+    } else if (character == Marker.DOUBLE_QUOTE && level == Level.ROOT) {
+      buffer.push(character);
+      level = Level.DOUBLE_QUOTE;
+    } else if (character == Marker.DOUBLE_QUOTE && level == Level.DOUBLE_QUOTE) {
+      buffer.push(character);
+      level = Level.ROOT;
+    } else if (character == Marker.SINGLE_QUOTE && level == Level.ROOT) {
+      buffer.push(character);
+      level = Level.SINGLE_QUOTE;
+    } else if (character == Marker.SINGLE_QUOTE && level == Level.SINGLE_QUOTE) {
+      buffer.push(character);
+      level = Level.ROOT;
+    } else if (isQuoted) {
+      buffer.push(character);
+    } else if (character == Marker.OPEN_ROUND_BRACKET) {
+      buffer.push(character);
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && roundBracketLevel == 1 && isPseudo) {
+      buffer.push(character);
+      list.push(buffer.join(''));
+      roundBracketLevel--;
+      buffer = [];
+      isPseudo = false;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET) {
+      buffer.push(character);
+      roundBracketLevel--;
+    } else if (character == Marker.COLON && roundBracketLevel === 0 && isPseudo && !wasColon) {
+      list.push(buffer.join(''));
+      buffer = [];
+      buffer.push(character);
+    } else if (character == Marker.COLON && roundBracketLevel === 0 && !wasColon) {
+      buffer = [];
+      buffer.push(character);
+      isPseudo = true;
+    } else if (character == Marker.SPACE && roundBracketLevel === 0 && isPseudo) {
+      list.push(buffer.join(''));
+      buffer = [];
+      isPseudo = false;
+    } else if (isRelation && roundBracketLevel === 0 && isPseudo) {
+      list.push(buffer.join(''));
+      buffer = [];
+      isPseudo = false;
+    } else {
+      buffer.push(character);
+    }
+
+    isEscaped = character == Marker.BACK_SLASH;
+    wasColon = character == Marker.COLON;
+  }
+
+  if (buffer.length > 0 && isPseudo) {
+    list.push(buffer.join(''));
+  }
+
+  return list;
+}
+
+function areMergeable(selector, matches, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) {
+  return areAllowed(matches, mergeablePseudoClasses, mergeablePseudoElements)
+    && needArguments(matches)
+    && (matches.length < 2 || !someIncorrectlyChained(selector, matches))
+    && (matches.length < 2 || multiplePseudoMerging && allMixable(matches));
+}
+
+function areAllowed(matches, mergeablePseudoClasses, mergeablePseudoElements) {
+  var match;
+  var name;
+  var i, l;
+
+  for (i = 0, l = matches.length; i < l; i++) {
+    match = matches[i];
+    name = match.indexOf(Marker.OPEN_ROUND_BRACKET) > -1
+      ? match.substring(0, match.indexOf(Marker.OPEN_ROUND_BRACKET))
+      : match;
+
+    if (mergeablePseudoClasses.indexOf(name) === -1 && mergeablePseudoElements.indexOf(name) === -1) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function needArguments(matches) {
+  var match;
+  var name;
+  var bracketOpensAt;
+  var hasArguments;
+  var i, l;
+
+  for (i = 0, l = matches.length; i < l; i++) {
+    match = matches[i];
+
+    bracketOpensAt = match.indexOf(Marker.OPEN_ROUND_BRACKET);
+    hasArguments = bracketOpensAt > -1;
+    name = hasArguments
+      ? match.substring(0, bracketOpensAt)
+      : match;
+
+    if (hasArguments && PSEUDO_CLASSES_WITH_ARGUMENTS.indexOf(name) == -1) {
+      return false;
+    }
+
+    if (!hasArguments && PSEUDO_CLASSES_WITH_ARGUMENTS.indexOf(name) > -1) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function someIncorrectlyChained(selector, matches) {
+  var positionInSelector = 0;
+  var match;
+  var matchAt;
+  var nextMatch;
+  var nextMatchAt;
+  var name;
+  var nextName;
+  var areChained;
+  var i, l;
+
+  for (i = 0, l = matches.length; i < l; i++) {
+    match = matches[i];
+    nextMatch = matches[i + 1];
+
+    if (!nextMatch) {
+      break;
+    }
+
+    matchAt = selector.indexOf(match, positionInSelector);
+    nextMatchAt = selector.indexOf(match, matchAt + 1);
+    positionInSelector = nextMatchAt;
+    areChained = matchAt + match.length == nextMatchAt;
+
+    if (areChained) {
+      name = match.indexOf(Marker.OPEN_ROUND_BRACKET) > -1
+        ? match.substring(0, match.indexOf(Marker.OPEN_ROUND_BRACKET))
+        : match;
+      nextName = nextMatch.indexOf(Marker.OPEN_ROUND_BRACKET) > -1
+        ? nextMatch.substring(0, nextMatch.indexOf(Marker.OPEN_ROUND_BRACKET))
+        : nextMatch;
+
+      if (name != NOT_PSEUDO || nextName != NOT_PSEUDO) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+function allMixable(matches) {
+  var unmixableMatches = 0;
+  var match;
+  var i, l;
+
+  for (i = 0, l = matches.length; i < l; i++) {
+    match = matches[i];
+
+    if (isPseudoElement(match)) {
+      unmixableMatches += UNMIXABLE_PSEUDO_ELEMENTS.indexOf(match) > -1 ? 1 : 0;
+    } else {
+      unmixableMatches += UNMIXABLE_PSEUDO_CLASSES.indexOf(match) > -1 ? 1 : 0;
+    }
+
+    if (unmixableMatches > 1) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function isPseudoElement(pseudo) {
+  return DOUBLE_COLON_PATTERN.test(pseudo);
+}
+
+module.exports = isMergeable;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-adjacent.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-adjacent.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-adjacent.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,55 @@
+var isMergeable = require('./is-mergeable');
+
+var optimizeProperties = require('./properties/optimize');
+
+var sortSelectors = require('../level-1/sort-selectors');
+var tidyRules = require('../level-1/tidy-rules');
+
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+var Token = require('../../tokenizer/token');
+
+function mergeAdjacent(tokens, context) {
+  var lastToken = [null, [], []];
+  var options = context.options;
+  var adjacentSpace = options.compatibility.selectors.adjacentSpace;
+  var selectorsSortingMethod = options.level[OptimizationLevel.One].selectorsSortingMethod;
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var mergeLimit = options.compatibility.selectors.mergeLimit;
+  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    if (token[0] != Token.RULE) {
+      lastToken = [null, [], []];
+      continue;
+    }
+
+    if (lastToken[0] == Token.RULE && serializeRules(token[1]) == serializeRules(lastToken[1])) {
+      Array.prototype.push.apply(lastToken[2], token[2]);
+      optimizeProperties(lastToken[2], true, true, context);
+      token[2] = [];
+    } else if (lastToken[0] == Token.RULE && serializeBody(token[2]) == serializeBody(lastToken[2])
+        && isMergeable(serializeRules(token[1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging)
+        && isMergeable(
+          serializeRules(lastToken[1]),
+          mergeablePseudoClasses,
+          mergeablePseudoElements,
+          multiplePseudoMerging
+        )
+        && lastToken[1].length < mergeLimit) {
+      lastToken[1] = tidyRules(lastToken[1].concat(token[1]), false, adjacentSpace, false, context.warnings);
+      lastToken[1] = lastToken.length > 1 ? sortSelectors(lastToken[1], selectorsSortingMethod) : lastToken[1];
+      token[2] = [];
+    } else {
+      lastToken = token;
+    }
+  }
+}
+
+module.exports = mergeAdjacent;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-media-queries.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-media-queries.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-media-queries.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,105 @@
+var canReorder = require('./reorderable').canReorder;
+var canReorderSingle = require('./reorderable').canReorderSingle;
+var extractProperties = require('./extract-properties');
+var rulesOverlap = require('./rules-overlap');
+
+var serializeRules = require('../../writer/one-time').rules;
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+var Token = require('../../tokenizer/token');
+
+function mergeMediaQueries(tokens, context) {
+  var mergeSemantically = context.options.level[OptimizationLevel.Two].mergeSemantically;
+  var specificityCache = context.cache.specificity;
+  var candidates = {};
+  var reduced = [];
+
+  for (var i = tokens.length - 1; i >= 0; i--) {
+    var token = tokens[i];
+    if (token[0] != Token.NESTED_BLOCK) {
+      continue;
+    }
+
+    var key = serializeRules(token[1]);
+    var candidate = candidates[key];
+    if (!candidate) {
+      candidate = [];
+      candidates[key] = candidate;
+    }
+
+    candidate.push(i);
+  }
+
+  for (var name in candidates) {
+    var positions = candidates[name];
+
+    positionLoop:
+    for (var j = positions.length - 1; j > 0; j--) {
+      var positionOne = positions[j];
+      var tokenOne = tokens[positionOne];
+      var positionTwo = positions[j - 1];
+      var tokenTwo = tokens[positionTwo];
+
+      directionLoop:
+      for (var direction = 1; direction >= -1; direction -= 2) {
+        var topToBottom = direction == 1;
+        var from = topToBottom ? positionOne + 1 : positionTwo - 1;
+        var to = topToBottom ? positionTwo : positionOne;
+        var delta = topToBottom ? 1 : -1;
+        var source = topToBottom ? tokenOne : tokenTwo;
+        var target = topToBottom ? tokenTwo : tokenOne;
+        var movedProperties = extractProperties(source);
+
+        while (from != to) {
+          var traversedProperties = extractProperties(tokens[from]);
+          from += delta;
+
+          if (mergeSemantically
+            && allSameRulePropertiesCanBeReordered(movedProperties, traversedProperties, specificityCache)
+          ) {
+            continue;
+          }
+
+          if (!canReorder(movedProperties, traversedProperties, specificityCache)) { continue directionLoop; }
+        }
+
+        target[2] = topToBottom
+          ? source[2].concat(target[2])
+          : target[2].concat(source[2]);
+        source[2] = [];
+
+        reduced.push(target);
+        continue positionLoop;
+      }
+    }
+  }
+
+  return reduced;
+}
+
+function allSameRulePropertiesCanBeReordered(movedProperties, traversedProperties, specificityCache) {
+  var movedProperty;
+  var movedRule;
+  var traversedProperty;
+  var traversedRule;
+  var i, l;
+  var j, m;
+
+  for (i = 0, l = movedProperties.length; i < l; i++) {
+    movedProperty = movedProperties[i];
+    movedRule = movedProperty[5];
+
+    for (j = 0, m = traversedProperties.length; j < m; j++) {
+      traversedProperty = traversedProperties[j];
+      traversedRule = traversedProperty[5];
+
+      if (rulesOverlap(movedRule, traversedRule, true)
+        && !canReorderSingle(movedProperty, traversedProperty, specificityCache)) {
+        return false;
+      }
+    }
+  }
+
+  return true;
+}
+
+module.exports = mergeMediaQueries;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-body.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-body.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-body.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,88 @@
+var isMergeable = require('./is-mergeable');
+
+var sortSelectors = require('../level-1/sort-selectors');
+var tidyRules = require('../level-1/tidy-rules');
+
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+var Token = require('../../tokenizer/token');
+
+function unsafeSelector(value) {
+  return /\.|\*| :/.test(value);
+}
+
+function isBemElement(token) {
+  var asString = serializeRules(token[1]);
+  return asString.indexOf('__') > -1 || asString.indexOf('--') > -1;
+}
+
+function withoutModifier(selector) {
+  return selector.replace(/--[^ ,>+~:]+/g, '');
+}
+
+function removeAnyUnsafeElements(left, candidates) {
+  var leftSelector = withoutModifier(serializeRules(left[1]));
+
+  for (var body in candidates) {
+    var right = candidates[body];
+    var rightSelector = withoutModifier(serializeRules(right[1]));
+
+    if (rightSelector.indexOf(leftSelector) > -1 || leftSelector.indexOf(rightSelector) > -1) {
+      delete candidates[body];
+    }
+  }
+}
+
+function mergeNonAdjacentByBody(tokens, context) {
+  var options = context.options;
+  var mergeSemantically = options.level[OptimizationLevel.Two].mergeSemantically;
+  var adjacentSpace = options.compatibility.selectors.adjacentSpace;
+  var selectorsSortingMethod = options.level[OptimizationLevel.One].selectorsSortingMethod;
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
+  var candidates = {};
+
+  for (var i = tokens.length - 1; i >= 0; i--) {
+    var token = tokens[i];
+    if (token[0] != Token.RULE) { continue; }
+
+    if (token[2].length > 0 && (!mergeSemantically && unsafeSelector(serializeRules(token[1])))) { candidates = {}; }
+
+    if (token[2].length > 0 && mergeSemantically && isBemElement(token)) { removeAnyUnsafeElements(token, candidates); }
+
+    var candidateBody = serializeBody(token[2]);
+    var oldToken = candidates[candidateBody];
+    if (oldToken
+        && isMergeable(
+          serializeRules(token[1]),
+          mergeablePseudoClasses,
+          mergeablePseudoElements,
+          multiplePseudoMerging
+        )
+        && isMergeable(
+          serializeRules(oldToken[1]),
+          mergeablePseudoClasses,
+          mergeablePseudoElements,
+          multiplePseudoMerging
+        )
+    ) {
+      if (token[2].length > 0) {
+        token[1] = tidyRules(oldToken[1].concat(token[1]), false, adjacentSpace, false, context.warnings);
+        token[1] = token[1].length > 1 ? sortSelectors(token[1], selectorsSortingMethod) : token[1];
+      } else {
+        token[1] = oldToken[1].concat(token[1]);
+      }
+
+      oldToken[2] = [];
+      candidates[candidateBody] = null;
+    }
+
+    candidates[serializeBody(token[2])] = token;
+  }
+}
+
+module.exports = mergeNonAdjacentByBody;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-selector.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-selector.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-selector.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,73 @@
+var canReorder = require('./reorderable').canReorder;
+var extractProperties = require('./extract-properties');
+
+var optimizeProperties = require('./properties/optimize');
+
+var serializeRules = require('../../writer/one-time').rules;
+
+var Token = require('../../tokenizer/token');
+
+function mergeNonAdjacentBySelector(tokens, context) {
+  var specificityCache = context.cache.specificity;
+  var allSelectors = {};
+  var repeatedSelectors = [];
+  var i;
+
+  for (i = tokens.length - 1; i >= 0; i--) {
+    if (tokens[i][0] != Token.RULE) { continue; }
+    if (tokens[i][2].length === 0) { continue; }
+
+    var selector = serializeRules(tokens[i][1]);
+    allSelectors[selector] = [i].concat(allSelectors[selector] || []);
+
+    if (allSelectors[selector].length == 2) { repeatedSelectors.push(selector); }
+  }
+
+  for (i = repeatedSelectors.length - 1; i >= 0; i--) {
+    var positions = allSelectors[repeatedSelectors[i]];
+
+    selectorIterator:
+    for (var j = positions.length - 1; j > 0; j--) {
+      var positionOne = positions[j - 1];
+      var tokenOne = tokens[positionOne];
+      var positionTwo = positions[j];
+      var tokenTwo = tokens[positionTwo];
+
+      directionIterator:
+      for (var direction = 1; direction >= -1; direction -= 2) {
+        var topToBottom = direction == 1;
+        var from = topToBottom ? positionOne + 1 : positionTwo - 1;
+        var to = topToBottom ? positionTwo : positionOne;
+        var delta = topToBottom ? 1 : -1;
+        var moved = topToBottom ? tokenOne : tokenTwo;
+        var target = topToBottom ? tokenTwo : tokenOne;
+        var movedProperties = extractProperties(moved);
+
+        while (from != to) {
+          var traversedProperties = extractProperties(tokens[from]);
+          from += delta;
+
+          // traversed then moved as we move selectors towards the start
+          var reorderable = topToBottom
+            ? canReorder(movedProperties, traversedProperties, specificityCache)
+            : canReorder(traversedProperties, movedProperties, specificityCache);
+
+          if (!reorderable && !topToBottom) { continue selectorIterator; }
+          if (!reorderable && topToBottom) { continue directionIterator; }
+        }
+
+        if (topToBottom) {
+          Array.prototype.push.apply(moved[2], target[2]);
+          target[2] = moved[2];
+        } else {
+          Array.prototype.push.apply(target[2], moved[2]);
+        }
+
+        optimizeProperties(target[2], true, true, context);
+        moved[2] = [];
+      }
+    }
+  }
+}
+
+module.exports = mergeNonAdjacentBySelector;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/optimize.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/optimize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/optimize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,139 @@
+var mergeAdjacent = require('./merge-adjacent');
+var mergeMediaQueries = require('./merge-media-queries');
+var mergeNonAdjacentByBody = require('./merge-non-adjacent-by-body');
+var mergeNonAdjacentBySelector = require('./merge-non-adjacent-by-selector');
+var reduceNonAdjacent = require('./reduce-non-adjacent');
+var removeDuplicateFontAtRules = require('./remove-duplicate-font-at-rules');
+var removeDuplicateMediaQueries = require('./remove-duplicate-media-queries');
+var removeDuplicates = require('./remove-duplicates');
+var removeUnusedAtRules = require('./remove-unused-at-rules');
+var restructure = require('./restructure');
+
+var optimizeProperties = require('./properties/optimize');
+
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+
+var Token = require('../../tokenizer/token');
+
+function removeEmpty(tokens) {
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+    var isEmpty = false;
+
+    switch (token[0]) {
+    case Token.RULE:
+      isEmpty = token[1].length === 0 || token[2].length === 0;
+      break;
+    case Token.NESTED_BLOCK:
+      removeEmpty(token[2]);
+      isEmpty = token[2].length === 0;
+      break;
+    case Token.AT_RULE:
+      isEmpty = token[1].length === 0;
+      break;
+    case Token.AT_RULE_BLOCK:
+      isEmpty = token[2].length === 0;
+    }
+
+    if (isEmpty) {
+      tokens.splice(i, 1);
+      i--;
+      l--;
+    }
+  }
+}
+
+function recursivelyOptimizeBlocks(tokens, context) {
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    if (token[0] == Token.NESTED_BLOCK) {
+      var isKeyframes = /@(-moz-|-o-|-webkit-)?keyframes/.test(token[1][0][1]);
+      level2Optimize(token[2], context, !isKeyframes);
+    }
+  }
+}
+
+function recursivelyOptimizeProperties(tokens, context) {
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    switch (token[0]) {
+    case Token.RULE:
+      optimizeProperties(token[2], true, true, context);
+      break;
+    case Token.NESTED_BLOCK:
+      recursivelyOptimizeProperties(token[2], context);
+    }
+  }
+}
+
+function level2Optimize(tokens, context, withRestructuring) {
+  var levelOptions = context.options.level[OptimizationLevel.Two];
+  var level2Plugins = context.options.plugins.level2Block;
+  var reduced;
+  var i;
+
+  recursivelyOptimizeBlocks(tokens, context);
+  recursivelyOptimizeProperties(tokens, context);
+
+  if (levelOptions.removeDuplicateRules) {
+    removeDuplicates(tokens, context);
+  }
+
+  if (levelOptions.mergeAdjacentRules) {
+    mergeAdjacent(tokens, context);
+  }
+
+  if (levelOptions.reduceNonAdjacentRules) {
+    reduceNonAdjacent(tokens, context);
+  }
+
+  if (levelOptions.mergeNonAdjacentRules && levelOptions.mergeNonAdjacentRules != 'body') {
+    mergeNonAdjacentBySelector(tokens, context);
+  }
+
+  if (levelOptions.mergeNonAdjacentRules && levelOptions.mergeNonAdjacentRules != 'selector') {
+    mergeNonAdjacentByBody(tokens, context);
+  }
+
+  if (levelOptions.restructureRules && levelOptions.mergeAdjacentRules && withRestructuring) {
+    restructure(tokens, context);
+    mergeAdjacent(tokens, context);
+  }
+
+  if (levelOptions.restructureRules && !levelOptions.mergeAdjacentRules && withRestructuring) {
+    restructure(tokens, context);
+  }
+
+  if (levelOptions.removeDuplicateFontRules) {
+    removeDuplicateFontAtRules(tokens, context);
+  }
+
+  if (levelOptions.removeDuplicateMediaBlocks) {
+    removeDuplicateMediaQueries(tokens, context);
+  }
+
+  if (levelOptions.removeUnusedAtRules) {
+    removeUnusedAtRules(tokens, context);
+  }
+
+  if (levelOptions.mergeMedia) {
+    reduced = mergeMediaQueries(tokens, context);
+    for (i = reduced.length - 1; i >= 0; i--) {
+      level2Optimize(reduced[i][2], context, false);
+    }
+  }
+
+  for (i = 0; i < level2Plugins.length; i++) {
+    level2Plugins[i](tokens);
+  }
+
+  if (levelOptions.removeEmpty) {
+    removeEmpty(tokens);
+  }
+
+  return tokens;
+}
+
+module.exports = level2Optimize;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/every-values-pair.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/every-values-pair.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/every-values-pair.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,28 @@
+var Marker = require('../../../tokenizer/marker');
+
+function everyValuesPair(fn, left, right) {
+  var leftSize = left.value.length;
+  var rightSize = right.value.length;
+  var total = Math.max(leftSize, rightSize);
+  var lowerBound = Math.min(leftSize, rightSize) - 1;
+  var leftValue;
+  var rightValue;
+  var position;
+
+  for (position = 0; position < total; position++) {
+    leftValue = left.value[position] && left.value[position][1] || leftValue;
+    rightValue = right.value[position] && right.value[position][1] || rightValue;
+
+    if (leftValue == Marker.COMMA || rightValue == Marker.COMMA) {
+      continue;
+    }
+
+    if (!fn(leftValue, rightValue, position, position <= lowerBound)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+module.exports = everyValuesPair;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/find-component-in.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/find-component-in.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/find-component-in.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,38 @@
+var configuration = require('../../configuration');
+
+function findComponentIn(shorthand, longhand) {
+  var comparator = nameComparator(longhand);
+
+  return findInDirectComponents(shorthand, comparator) || findInSubComponents(shorthand, comparator);
+}
+
+function nameComparator(to) {
+  return function(property) {
+    return to.name === property.name;
+  };
+}
+
+function findInDirectComponents(shorthand, comparator) {
+  return shorthand.components.filter(comparator)[0];
+}
+
+function findInSubComponents(shorthand, comparator) {
+  var shorthandComponent;
+  var longhandMatch;
+  var i, l;
+
+  if (!configuration[shorthand.name].shorthandComponents) {
+    return;
+  }
+
+  for (i = 0, l = shorthand.components.length; i < l; i++) {
+    shorthandComponent = shorthand.components[i];
+    longhandMatch = findInDirectComponents(shorthandComponent, comparator);
+
+    if (longhandMatch) {
+      return longhandMatch;
+    }
+  }
+}
+
+module.exports = findComponentIn;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/has-inherit.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/has-inherit.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/has-inherit.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,9 @@
+function hasInherit(property) {
+  for (var i = property.value.length - 1; i >= 0; i--) {
+    if (property.value[i][1] == 'inherit') { return true; }
+  }
+
+  return false;
+}
+
+module.exports = hasInherit;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/has-same-values.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/has-same-values.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/has-same-values.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,14 @@
+function hasSameValues(property) {
+  var firstValue = property.value[0][1];
+  var i, l;
+
+  for (i = 1, l = property.value.length; i < l; i++) {
+    if (property.value[i][1] != firstValue) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+module.exports = hasSameValues;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/has-unset.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/has-unset.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/has-unset.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,9 @@
+function hasUnset(property) {
+  for (var i = property.value.length - 1; i >= 0; i--) {
+    if (property.value[i][1] == 'unset') { return true; }
+  }
+
+  return false;
+}
+
+module.exports = hasUnset;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/is-component-of.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/is-component-of.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/is-component-of.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,22 @@
+var configuration = require('../../configuration');
+
+function isComponentOf(property1, property2, shallow) {
+  return isDirectComponentOf(property1, property2)
+    || !shallow && !!configuration[property1.name].shorthandComponents && isSubComponentOf(property1, property2);
+}
+
+function isDirectComponentOf(property1, property2) {
+  var descriptor = configuration[property1.name];
+
+  return 'components' in descriptor && descriptor.components.indexOf(property2.name) > -1;
+}
+
+function isSubComponentOf(property1, property2) {
+  return property1
+    .components
+    .some(function(component) {
+      return isDirectComponentOf(component, property2);
+    });
+}
+
+module.exports = isComponentOf;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/is-mergeable-shorthand.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/is-mergeable-shorthand.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/is-mergeable-shorthand.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,11 @@
+var Marker = require('../../../tokenizer/marker');
+
+function isMergeableShorthand(shorthand) {
+  if (shorthand.name != 'font') {
+    return true;
+  }
+
+  return shorthand.value[0][1].indexOf(Marker.INTERNAL) == -1;
+}
+
+module.exports = isMergeableShorthand;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/merge-into-shorthands.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/merge-into-shorthands.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/merge-into-shorthands.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,496 @@
+var everyValuesPair = require('./every-values-pair');
+var hasInherit = require('./has-inherit');
+var hasSameValues = require('./has-same-values');
+var populateComponents = require('./populate-components');
+
+var configuration = require('../../configuration');
+var deepClone = require('../../clone').deep;
+var restoreWithComponents = require('../restore-with-components');
+
+var restoreFromOptimizing = require('../../restore-from-optimizing');
+var wrapSingle = require('../../wrap-for-optimizing').single;
+
+var serializeBody = require('../../../writer/one-time').body;
+var Token = require('../../../tokenizer/token');
+
+function mergeIntoShorthands(properties, validator) {
+  var candidates = {};
+  var descriptor;
+  var componentOf;
+  var property;
+  var i, l;
+  var j, m;
+
+  // there is no shorthand property made up of less than 3 longhands
+  if (properties.length < 3) {
+    return;
+  }
+
+  for (i = 0, l = properties.length; i < l; i++) {
+    property = properties[i];
+    descriptor = configuration[property.name];
+
+    if (property.dynamic) {
+      continue;
+    }
+
+    if (property.unused) {
+      continue;
+    }
+
+    if (property.hack) {
+      continue;
+    }
+
+    if (property.block) {
+      continue;
+    }
+
+    if (descriptor && descriptor.singleTypeComponents && !hasSameValues(property)) {
+      continue;
+    }
+
+    invalidateOrCompact(properties, i, candidates, validator);
+
+    if (descriptor && descriptor.componentOf) {
+      for (j = 0, m = descriptor.componentOf.length; j < m; j++) {
+        componentOf = descriptor.componentOf[j];
+
+        candidates[componentOf] = candidates[componentOf] || {};
+        candidates[componentOf][property.name] = property;
+      }
+    }
+  }
+
+  invalidateOrCompact(properties, i, candidates, validator);
+}
+
+function invalidateOrCompact(properties, position, candidates, validator) {
+  var invalidatedBy = properties[position];
+  var shorthandName;
+  var shorthandDescriptor;
+  var candidateComponents;
+  var replacedCandidates = [];
+  var i;
+
+  for (shorthandName in candidates) {
+    if (undefined !== invalidatedBy && shorthandName == invalidatedBy.name) {
+      continue;
+    }
+
+    shorthandDescriptor = configuration[shorthandName];
+    candidateComponents = candidates[shorthandName];
+    if (invalidatedBy && invalidates(candidates, shorthandName, invalidatedBy)) {
+      delete candidates[shorthandName];
+      continue;
+    }
+
+    if (shorthandDescriptor.components.length > Object.keys(candidateComponents).length) {
+      continue;
+    }
+
+    if (mixedImportance(candidateComponents)) {
+      continue;
+    }
+
+    if (!overridable(candidateComponents, shorthandName, validator)) {
+      continue;
+    }
+
+    if (!mergeable(candidateComponents)) {
+      continue;
+    }
+
+    if (mixedInherit(candidateComponents)) {
+      replaceWithInheritBestFit(properties, candidateComponents, shorthandName, validator);
+    } else {
+      replaceWithShorthand(properties, candidateComponents, shorthandName, validator);
+    }
+
+    replacedCandidates.push(shorthandName);
+  }
+
+  for (i = replacedCandidates.length - 1; i >= 0; i--) {
+    delete candidates[replacedCandidates[i]];
+  }
+}
+
+function invalidates(candidates, shorthandName, invalidatedBy) {
+  var shorthandDescriptor = configuration[shorthandName];
+  var invalidatedByDescriptor = configuration[invalidatedBy.name];
+  var componentName;
+
+  if ('overridesShorthands' in shorthandDescriptor && shorthandDescriptor.overridesShorthands.indexOf(invalidatedBy.name) > -1) {
+    return true;
+  }
+
+  if (invalidatedByDescriptor && 'componentOf' in invalidatedByDescriptor) {
+    for (componentName in candidates[shorthandName]) {
+      if (invalidatedByDescriptor.componentOf.indexOf(componentName) > -1) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+function mixedImportance(components) {
+  var important;
+  var componentName;
+
+  for (componentName in components) {
+    if (undefined !== important && components[componentName].important != important) {
+      return true;
+    }
+
+    important = components[componentName].important;
+  }
+
+  return false;
+}
+
+function overridable(components, shorthandName, validator) {
+  var descriptor = configuration[shorthandName];
+  var newValuePlaceholder = [
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, shorthandName],
+    [Token.PROPERTY_VALUE, descriptor.defaultValue]
+  ];
+  var newProperty = wrapSingle(newValuePlaceholder);
+  var component;
+  var mayOverride;
+  var i, l;
+
+  populateComponents([newProperty], validator, []);
+
+  for (i = 0, l = descriptor.components.length; i < l; i++) {
+    component = components[descriptor.components[i]];
+    mayOverride = configuration[component.name].canOverride || sameValue;
+
+    if (!everyValuesPair(mayOverride.bind(null, validator), newProperty.components[i], component)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function sameValue(_validator, value1, value2) {
+  return value1 === value2;
+}
+
+function mergeable(components) {
+  var lastCount = null;
+  var currentCount;
+  var componentName;
+  var component;
+  var descriptor;
+  var values;
+
+  for (componentName in components) {
+    component = components[componentName];
+    descriptor = configuration[componentName];
+
+    if (!('restore' in descriptor)) {
+      continue;
+    }
+
+    restoreFromOptimizing([component.all[component.position]], restoreWithComponents);
+    values = descriptor.restore(component, configuration);
+
+    currentCount = values.length;
+
+    if (lastCount !== null && currentCount !== lastCount) {
+      return false;
+    }
+
+    lastCount = currentCount;
+  }
+
+  return true;
+}
+
+function mixedInherit(components) {
+  var componentName;
+  var lastValue = null;
+  var currentValue;
+
+  for (componentName in components) {
+    currentValue = hasInherit(components[componentName]);
+
+    if (lastValue !== null && lastValue !== currentValue) {
+      return true;
+    }
+
+    lastValue = currentValue;
+  }
+
+  return false;
+}
+
+function replaceWithInheritBestFit(properties, candidateComponents, shorthandName, validator) {
+  var viaLonghands = buildSequenceWithInheritLonghands(candidateComponents, shorthandName, validator);
+  var viaShorthand = buildSequenceWithInheritShorthand(candidateComponents, shorthandName, validator);
+  var longhandTokensSequence = viaLonghands[0];
+  var shorthandTokensSequence = viaShorthand[0];
+  var isLonghandsShorter = serializeBody(longhandTokensSequence).length < serializeBody(shorthandTokensSequence).length;
+  var newTokensSequence = isLonghandsShorter ? longhandTokensSequence : shorthandTokensSequence;
+  var newProperty = isLonghandsShorter ? viaLonghands[1] : viaShorthand[1];
+  var newComponents = isLonghandsShorter ? viaLonghands[2] : viaShorthand[2];
+  var lastComponent = candidateComponents[Object.keys(candidateComponents).pop()];
+  var all = lastComponent.all;
+  var insertAt = lastComponent.position;
+  var componentName;
+  var oldComponent;
+  var newComponent;
+  var newToken;
+
+  newProperty.position = insertAt;
+  newProperty.shorthand = true;
+  newProperty.important = lastComponent.important;
+  newProperty.multiplex = false;
+  newProperty.dirty = true;
+  newProperty.all = all;
+  newProperty.all[insertAt] = newTokensSequence[0];
+
+  properties.splice(insertAt, 1, newProperty);
+
+  for (componentName in candidateComponents) {
+    oldComponent = candidateComponents[componentName];
+    oldComponent.unused = true;
+
+    newProperty.multiplex = newProperty.multiplex || oldComponent.multiplex;
+
+    if (oldComponent.name in newComponents) {
+      newComponent = newComponents[oldComponent.name];
+      newToken = findTokenIn(newTokensSequence, componentName);
+
+      newComponent.position = all.length;
+      newComponent.all = all;
+      newComponent.all.push(newToken);
+
+      properties.push(newComponent);
+    }
+  }
+}
+
+function buildSequenceWithInheritLonghands(components, shorthandName, validator) {
+  var tokensSequence = [];
+  var inheritComponents = {};
+  var nonInheritComponents = {};
+  var descriptor = configuration[shorthandName];
+  var shorthandToken = [
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, shorthandName],
+    [Token.PROPERTY_VALUE, descriptor.defaultValue]
+  ];
+  var newProperty = wrapSingle(shorthandToken);
+  var component;
+  var longhandToken;
+  var newComponent;
+  var nameMetadata;
+  var i, l;
+
+  populateComponents([newProperty], validator, []);
+
+  for (i = 0, l = descriptor.components.length; i < l; i++) {
+    component = components[descriptor.components[i]];
+
+    if (hasInherit(component)) {
+      longhandToken = component.all[component.position].slice(0, 2);
+      Array.prototype.push.apply(longhandToken, component.value);
+      tokensSequence.push(longhandToken);
+
+      newComponent = deepClone(component);
+      newComponent.value = inferComponentValue(components, newComponent.name);
+
+      newProperty.components[i] = newComponent;
+      inheritComponents[component.name] = deepClone(component);
+    } else {
+      newComponent = deepClone(component);
+      newComponent.all = component.all;
+      newProperty.components[i] = newComponent;
+
+      nonInheritComponents[component.name] = component;
+    }
+  }
+
+  newProperty.important = components[Object.keys(components).pop()].important;
+
+  nameMetadata = joinMetadata(nonInheritComponents, 1);
+  shorthandToken[1].push(nameMetadata);
+
+  restoreFromOptimizing([newProperty], restoreWithComponents);
+
+  shorthandToken = shorthandToken.slice(0, 2);
+  Array.prototype.push.apply(shorthandToken, newProperty.value);
+
+  tokensSequence.unshift(shorthandToken);
+
+  return [tokensSequence, newProperty, inheritComponents];
+}
+
+function inferComponentValue(components, propertyName) {
+  var descriptor = configuration[propertyName];
+
+  if ('oppositeTo' in descriptor) {
+    return components[descriptor.oppositeTo].value;
+  }
+  return [[Token.PROPERTY_VALUE, descriptor.defaultValue]];
+}
+
+function joinMetadata(components, at) {
+  var metadata = [];
+  var component;
+  var originalValue;
+  var componentMetadata;
+  var componentName;
+
+  for (componentName in components) {
+    component = components[componentName];
+    originalValue = component.all[component.position];
+    componentMetadata = originalValue[at][originalValue[at].length - 1];
+
+    Array.prototype.push.apply(metadata, componentMetadata);
+  }
+
+  return metadata.sort(metadataSorter);
+}
+
+function metadataSorter(metadata1, metadata2) {
+  var line1 = metadata1[0];
+  var line2 = metadata2[0];
+  var column1 = metadata1[1];
+  var column2 = metadata2[1];
+
+  if (line1 < line2) {
+    return -1;
+  } if (line1 === line2) {
+    return column1 < column2 ? -1 : 1;
+  }
+  return 1;
+}
+
+function buildSequenceWithInheritShorthand(components, shorthandName, validator) {
+  var tokensSequence = [];
+  var inheritComponents = {};
+  var nonInheritComponents = {};
+  var descriptor = configuration[shorthandName];
+  var shorthandToken = [
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, shorthandName],
+    [Token.PROPERTY_VALUE, 'inherit']
+  ];
+  var newProperty = wrapSingle(shorthandToken);
+  var component;
+  var longhandToken;
+  var nameMetadata;
+  var valueMetadata;
+  var i, l;
+
+  populateComponents([newProperty], validator, []);
+
+  for (i = 0, l = descriptor.components.length; i < l; i++) {
+    component = components[descriptor.components[i]];
+
+    if (hasInherit(component)) {
+      inheritComponents[component.name] = component;
+    } else {
+      longhandToken = component.all[component.position].slice(0, 2);
+      Array.prototype.push.apply(longhandToken, component.value);
+      tokensSequence.push(longhandToken);
+
+      nonInheritComponents[component.name] = deepClone(component);
+    }
+  }
+
+  nameMetadata = joinMetadata(inheritComponents, 1);
+  shorthandToken[1].push(nameMetadata);
+
+  valueMetadata = joinMetadata(inheritComponents, 2);
+  shorthandToken[2].push(valueMetadata);
+
+  tokensSequence.unshift(shorthandToken);
+
+  return [tokensSequence, newProperty, nonInheritComponents];
+}
+
+function findTokenIn(tokens, componentName) {
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    if (tokens[i][1][1] == componentName) {
+      return tokens[i];
+    }
+  }
+}
+
+function replaceWithShorthand(properties, candidateComponents, shorthandName, validator) {
+  var descriptor = configuration[shorthandName];
+  var nameMetadata;
+  var valueMetadata;
+  var newValuePlaceholder = [
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, shorthandName],
+    [Token.PROPERTY_VALUE, descriptor.defaultValue]
+  ];
+  var all;
+  var insertAt = inferInsertAtFrom(properties, candidateComponents, shorthandName);
+
+  var newProperty = wrapSingle(newValuePlaceholder);
+  newProperty.shorthand = true;
+  newProperty.dirty = true;
+  newProperty.multiplex = false;
+
+  populateComponents([newProperty], validator, []);
+
+  for (var i = 0, l = descriptor.components.length; i < l; i++) {
+    var component = candidateComponents[descriptor.components[i]];
+
+    newProperty.components[i] = deepClone(component);
+    newProperty.important = component.important;
+    newProperty.multiplex = newProperty.multiplex || component.multiplex;
+
+    all = component.all;
+  }
+
+  for (var componentName in candidateComponents) {
+    candidateComponents[componentName].unused = true;
+  }
+
+  nameMetadata = joinMetadata(candidateComponents, 1);
+  newValuePlaceholder[1].push(nameMetadata);
+
+  valueMetadata = joinMetadata(candidateComponents, 2);
+  newValuePlaceholder[2].push(valueMetadata);
+
+  newProperty.position = insertAt;
+  newProperty.all = all;
+  newProperty.all[insertAt] = newValuePlaceholder;
+
+  properties.splice(insertAt, 1, newProperty);
+}
+
+function inferInsertAtFrom(properties, candidateComponents, shorthandName) {
+  var candidateComponentNames = Object.keys(candidateComponents);
+  var firstCandidatePosition = candidateComponents[candidateComponentNames[0]].position;
+  var lastCandidatePosition = candidateComponents[candidateComponentNames[candidateComponentNames.length - 1]].position;
+
+  if (shorthandName == 'border' && traversesVia(properties.slice(firstCandidatePosition, lastCandidatePosition), 'border-image')) {
+    return firstCandidatePosition;
+  }
+  return lastCandidatePosition;
+}
+
+function traversesVia(properties, propertyName) {
+  for (var i = properties.length - 1; i >= 0; i--) {
+    if (properties[i].name == propertyName) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+module.exports = mergeIntoShorthands;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/optimize.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/optimize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/optimize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,40 @@
+var mergeIntoShorthands = require('./merge-into-shorthands');
+var overrideProperties = require('./override-properties');
+var populateComponents = require('./populate-components');
+
+var restoreWithComponents = require('../restore-with-components');
+
+var wrapForOptimizing = require('../../wrap-for-optimizing').all;
+var removeUnused = require('../../remove-unused');
+var restoreFromOptimizing = require('../../restore-from-optimizing');
+
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+function optimizeProperties(properties, withOverriding, withMerging, context) {
+  var levelOptions = context.options.level[OptimizationLevel.Two];
+  var _properties = wrapForOptimizing(properties, levelOptions.skipProperties);
+  var _property;
+  var i, l;
+
+  populateComponents(_properties, context.validator, context.warnings);
+
+  for (i = 0, l = _properties.length; i < l; i++) {
+    _property = _properties[i];
+    if (_property.block) {
+      optimizeProperties(_property.value[0][1], withOverriding, withMerging, context);
+    }
+  }
+
+  if (withMerging && levelOptions.mergeIntoShorthands) {
+    mergeIntoShorthands(_properties, context.validator);
+  }
+
+  if (withOverriding && levelOptions.overrideProperties) {
+    overrideProperties(_properties, withMerging, context.options.compatibility, context.validator);
+  }
+
+  restoreFromOptimizing(_properties, restoreWithComponents);
+  removeUnused(_properties);
+}
+
+module.exports = optimizeProperties;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/override-properties.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/override-properties.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/override-properties.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,461 @@
+var hasInherit = require('./has-inherit');
+var hasUnset = require('./has-unset');
+var everyValuesPair = require('./every-values-pair');
+var findComponentIn = require('./find-component-in');
+var isComponentOf = require('./is-component-of');
+var isMergeableShorthand = require('./is-mergeable-shorthand');
+var overridesNonComponentShorthand = require('./overrides-non-component-shorthand');
+var sameVendorPrefixesIn = require('./../../vendor-prefixes').same;
+
+var configuration = require('../../configuration');
+var deepClone = require('../../clone').deep;
+var restoreWithComponents = require('../restore-with-components');
+var shallowClone = require('../../clone').shallow;
+
+var restoreFromOptimizing = require('../../restore-from-optimizing');
+
+var Token = require('../../../tokenizer/token');
+var Marker = require('../../../tokenizer/marker');
+
+var serializeProperty = require('../../../writer/one-time').property;
+
+function sameValue(_validator, value1, value2) {
+  return value1 === value2;
+}
+
+function wouldBreakCompatibility(property, validator) {
+  for (var i = 0; i < property.components.length; i++) {
+    var component = property.components[i];
+    var descriptor = configuration[component.name];
+    var canOverride = descriptor && descriptor.canOverride || sameValue;
+
+    var _component = shallowClone(component);
+    _component.value = [[Token.PROPERTY_VALUE, descriptor.defaultValue]];
+
+    if (!everyValuesPair(canOverride.bind(null, validator), _component, component)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function overrideIntoMultiplex(property, by) {
+  by.unused = true;
+
+  turnIntoMultiplex(by, multiplexSize(property));
+  property.value = by.value;
+}
+
+function overrideByMultiplex(property, by) {
+  by.unused = true;
+  property.multiplex = true;
+  property.value = by.value;
+}
+
+function overrideSimple(property, by) {
+  by.unused = true;
+  property.value = by.value;
+}
+
+function override(property, by) {
+  if (by.multiplex) {
+    overrideByMultiplex(property, by);
+  } else if (property.multiplex) {
+    overrideIntoMultiplex(property, by);
+  } else {
+    overrideSimple(property, by);
+  }
+}
+
+function overrideShorthand(property, by) {
+  by.unused = true;
+
+  for (var i = 0, l = property.components.length; i < l; i++) {
+    override(property.components[i], by.components[i]);
+  }
+}
+
+function turnIntoMultiplex(property, size) {
+  property.multiplex = true;
+
+  if (configuration[property.name].shorthand) {
+    turnShorthandValueIntoMultiplex(property, size);
+  } else {
+    turnLonghandValueIntoMultiplex(property, size);
+  }
+}
+
+function turnShorthandValueIntoMultiplex(property, size) {
+  var component;
+  var i, l;
+
+  for (i = 0, l = property.components.length; i < l; i++) {
+    component = property.components[i];
+
+    if (!component.multiplex) {
+      turnLonghandValueIntoMultiplex(component, size);
+    }
+  }
+}
+
+function turnLonghandValueIntoMultiplex(property, size) {
+  var descriptor = configuration[property.name];
+  var withRealValue = descriptor.intoMultiplexMode == 'real';
+  var withValue = descriptor.intoMultiplexMode == 'real'
+    ? property.value.slice(0)
+    : (descriptor.intoMultiplexMode == 'placeholder' ? descriptor.placeholderValue : descriptor.defaultValue);
+  var i = multiplexSize(property);
+  var j;
+  var m = withValue.length;
+
+  for (; i < size; i++) {
+    property.value.push([Token.PROPERTY_VALUE, Marker.COMMA]);
+
+    if (Array.isArray(withValue)) {
+      for (j = 0; j < m; j++) {
+        property.value.push(withRealValue ? withValue[j] : [Token.PROPERTY_VALUE, withValue[j]]);
+      }
+    } else {
+      property.value.push(withRealValue ? withValue : [Token.PROPERTY_VALUE, withValue]);
+    }
+  }
+}
+
+function multiplexSize(component) {
+  var size = 0;
+
+  for (var i = 0, l = component.value.length; i < l; i++) {
+    if (component.value[i][1] == Marker.COMMA) { size++; }
+  }
+
+  return size + 1;
+}
+
+function lengthOf(property) {
+  var fakeAsArray = [
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, property.name]
+  ].concat(property.value);
+  return serializeProperty([fakeAsArray], 0).length;
+}
+
+function moreSameShorthands(properties, startAt, name) {
+  // Since we run the main loop in `compactOverrides` backwards, at this point some
+  // properties may not be marked as unused.
+  // We should consider reverting the order if possible
+  var count = 0;
+
+  for (var i = startAt; i >= 0; i--) {
+    if (properties[i].name == name && !properties[i].unused) { count++; }
+    if (count > 1) { break; }
+  }
+
+  return count > 1;
+}
+
+function overridingFunction(shorthand, validator) {
+  for (var i = 0, l = shorthand.components.length; i < l; i++) {
+    if (!anyValue(validator.isUrl, shorthand.components[i])
+      && anyValue(validator.isFunction, shorthand.components[i])) { return true; }
+  }
+
+  return false;
+}
+
+function anyValue(fn, property) {
+  for (var i = 0, l = property.value.length; i < l; i++) {
+    if (property.value[i][1] == Marker.COMMA) { continue; }
+
+    if (fn(property.value[i][1])) { return true; }
+  }
+
+  return false;
+}
+
+function wouldResultInLongerValue(left, right) {
+  if (!left.multiplex && !right.multiplex || left.multiplex && right.multiplex) { return false; }
+
+  var multiplex = left.multiplex ? left : right;
+  var simple = left.multiplex ? right : left;
+  var component;
+
+  var multiplexClone = deepClone(multiplex);
+  restoreFromOptimizing([multiplexClone], restoreWithComponents);
+
+  var simpleClone = deepClone(simple);
+  restoreFromOptimizing([simpleClone], restoreWithComponents);
+
+  var lengthBefore = lengthOf(multiplexClone) + 1 + lengthOf(simpleClone);
+
+  if (left.multiplex) {
+    component = findComponentIn(multiplexClone, simpleClone);
+    overrideIntoMultiplex(component, simpleClone);
+  } else {
+    component = findComponentIn(simpleClone, multiplexClone);
+    turnIntoMultiplex(simpleClone, multiplexSize(multiplexClone));
+    overrideByMultiplex(component, multiplexClone);
+  }
+
+  restoreFromOptimizing([simpleClone], restoreWithComponents);
+
+  var lengthAfter = lengthOf(simpleClone);
+
+  return lengthBefore <= lengthAfter;
+}
+
+function isCompactable(property) {
+  return property.name in configuration;
+}
+
+function noneOverrideHack(left, right) {
+  return !left.multiplex
+    && (left.name == 'background' || left.name == 'background-image')
+    && right.multiplex
+    && (right.name == 'background' || right.name == 'background-image')
+    && anyLayerIsNone(right.value);
+}
+
+function anyLayerIsNone(values) {
+  var layers = intoLayers(values);
+
+  for (var i = 0, l = layers.length; i < l; i++) {
+    if (layers[i].length == 1 && layers[i][0][1] == 'none') { return true; }
+  }
+
+  return false;
+}
+
+function intoLayers(values) {
+  var layers = [];
+
+  for (var i = 0, layer = [], l = values.length; i < l; i++) {
+    var value = values[i];
+    if (value[1] == Marker.COMMA) {
+      layers.push(layer);
+      layer = [];
+    } else {
+      layer.push(value);
+    }
+  }
+
+  layers.push(layer);
+  return layers;
+}
+
+function overrideProperties(properties, withMerging, compatibility, validator) {
+  var mayOverride, right, left, component;
+  var overriddenComponents;
+  var overriddenComponent;
+  var overridingComponent;
+  var overridable;
+  var i, j, k;
+
+  propertyLoop:
+  for (i = properties.length - 1; i >= 0; i--) {
+    right = properties[i];
+
+    if (!isCompactable(right)) { continue; }
+
+    if (right.block) { continue; }
+
+    mayOverride = configuration[right.name].canOverride || sameValue;
+
+    traverseLoop:
+    for (j = i - 1; j >= 0; j--) {
+      left = properties[j];
+
+      if (!isCompactable(left)) { continue; }
+
+      if (left.block) { continue; }
+
+      if (left.dynamic || right.dynamic) { continue; }
+
+      if (left.unused || right.unused) { continue; }
+
+      if (left.hack && !right.hack && !right.important || !left.hack && !left.important && right.hack) { continue; }
+
+      if (left.important == right.important && left.hack[0] != right.hack[0]) { continue; }
+
+      if (left.important == right.important
+        && (left.hack[0] != right.hack[0] || (left.hack[1] && left.hack[1] != right.hack[1]))) { continue; }
+
+      if (hasInherit(right)) { continue; }
+
+      if (noneOverrideHack(left, right)) { continue; }
+
+      if (right.shorthand && isComponentOf(right, left)) {
+        // maybe `left` can be overridden by `right` which is a shorthand?
+        if (!right.important && left.important) { continue; }
+
+        if (!sameVendorPrefixesIn([left], right.components)) { continue; }
+
+        if (!anyValue(validator.isFunction, left) && overridingFunction(right, validator)) { continue; }
+
+        if (!isMergeableShorthand(right)) {
+          left.unused = true;
+          continue;
+        }
+
+        component = findComponentIn(right, left);
+        mayOverride = configuration[left.name].canOverride || sameValue;
+        if (everyValuesPair(mayOverride.bind(null, validator), left, component)) {
+          left.unused = true;
+        }
+      } else if (right.shorthand && overridesNonComponentShorthand(right, left)) {
+        // `right` is a shorthand while `left` can be overriden by it, think `border` and `border-top`
+        if (!right.important && left.important) {
+          continue;
+        }
+
+        if (!sameVendorPrefixesIn([left], right.components)) {
+          continue;
+        }
+
+        if (!anyValue(validator.isFunction, left) && overridingFunction(right, validator)) {
+          continue;
+        }
+
+        overriddenComponents = left.shorthand
+          ? left.components
+          : [left];
+
+        for (k = overriddenComponents.length - 1; k >= 0; k--) {
+          overriddenComponent = overriddenComponents[k];
+          overridingComponent = findComponentIn(right, overriddenComponent);
+          mayOverride = configuration[overriddenComponent.name].canOverride || sameValue;
+
+          if (!everyValuesPair(mayOverride.bind(null, validator), left, overridingComponent)) {
+            continue traverseLoop;
+          }
+        }
+
+        left.unused = true;
+      } else if (withMerging && left.shorthand && !right.shorthand && isComponentOf(left, right, true)) {
+        // maybe `right` can be pulled into `left` which is a shorthand?
+        if (right.important && !left.important) { continue; }
+
+        if (!right.important && left.important) {
+          right.unused = true;
+          continue;
+        }
+
+        // Pending more clever algorithm in #527
+        if (moreSameShorthands(properties, i - 1, left.name)) { continue; }
+
+        if (overridingFunction(left, validator)) { continue; }
+
+        if (!isMergeableShorthand(left)) { continue; }
+
+        if (hasUnset(left) || hasUnset(right)) { continue; }
+
+        component = findComponentIn(left, right);
+        if (everyValuesPair(mayOverride.bind(null, validator), component, right)) {
+          var disabledBackgroundMerging = !compatibility.properties.backgroundClipMerging && component.name.indexOf('background-clip') > -1
+            || !compatibility.properties.backgroundOriginMerging && component.name.indexOf('background-origin') > -1
+            || !compatibility.properties.backgroundSizeMerging && component.name.indexOf('background-size') > -1;
+          var nonMergeableValue = configuration[right.name].nonMergeableValue === right.value[0][1];
+
+          if (disabledBackgroundMerging || nonMergeableValue) { continue; }
+
+          if (!compatibility.properties.merging && wouldBreakCompatibility(left, validator)) { continue; }
+
+          if (component.value[0][1] != right.value[0][1] && (hasInherit(left) || hasInherit(right))) { continue; }
+
+          if (wouldResultInLongerValue(left, right)) { continue; }
+
+          if (!left.multiplex && right.multiplex) { turnIntoMultiplex(left, multiplexSize(right)); }
+
+          override(component, right);
+          left.dirty = true;
+        }
+      } else if (withMerging && left.shorthand && right.shorthand && left.name == right.name) {
+        // merge if all components can be merged
+
+        if (!left.multiplex && right.multiplex) { continue; }
+
+        if (!right.important && left.important) {
+          right.unused = true;
+          continue propertyLoop;
+        }
+
+        if (right.important && !left.important) {
+          left.unused = true;
+          continue;
+        }
+
+        if (!isMergeableShorthand(right)) {
+          left.unused = true;
+          continue;
+        }
+
+        for (k = left.components.length - 1; k >= 0; k--) {
+          var leftComponent = left.components[k];
+          var rightComponent = right.components[k];
+
+          mayOverride = configuration[leftComponent.name].canOverride || sameValue;
+          if (!everyValuesPair(mayOverride.bind(null, validator), leftComponent, rightComponent)) {
+            continue propertyLoop;
+          }
+        }
+
+        overrideShorthand(left, right);
+        left.dirty = true;
+      } else if (withMerging && left.shorthand && right.shorthand && isComponentOf(left, right)) {
+        // border is a shorthand but any of its components is a shorthand too
+
+        if (!left.important && right.important) { continue; }
+
+        component = findComponentIn(left, right);
+        mayOverride = configuration[right.name].canOverride || sameValue;
+        if (!everyValuesPair(mayOverride.bind(null, validator), component, right)) { continue; }
+
+        if (left.important && !right.important) {
+          right.unused = true;
+          continue;
+        }
+
+        var rightRestored = configuration[right.name].restore(right, configuration);
+        if (rightRestored.length > 1) { continue; }
+
+        component = findComponentIn(left, right);
+        override(component, right);
+        right.dirty = true;
+      } else if (left.name == right.name) {
+        // two non-shorthands should be merged based on understandability
+        overridable = true;
+
+        if (right.shorthand) {
+          for (k = right.components.length - 1; k >= 0 && overridable; k--) {
+            overriddenComponent = left.components[k];
+            overridingComponent = right.components[k];
+            mayOverride = configuration[overridingComponent.name].canOverride || sameValue;
+
+            overridable = everyValuesPair(mayOverride.bind(null, validator), overriddenComponent, overridingComponent);
+          }
+        } else {
+          mayOverride = configuration[right.name].canOverride || sameValue;
+          overridable = everyValuesPair(mayOverride.bind(null, validator), left, right);
+        }
+
+        if (left.important && !right.important && overridable) {
+          right.unused = true;
+          continue;
+        }
+
+        if (!left.important && right.important && overridable) {
+          left.unused = true;
+          continue;
+        }
+
+        if (!overridable) {
+          continue;
+        }
+
+        left.unused = true;
+      }
+    }
+  }
+}
+
+module.exports = overrideProperties;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/overrides-non-component-shorthand.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/overrides-non-component-shorthand.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/overrides-non-component-shorthand.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,9 @@
+var configuration = require('../../configuration');
+
+function overridesNonComponentShorthand(property1, property2) {
+  return property1.name in configuration
+    && 'overridesShorthands' in configuration[property1.name]
+    && configuration[property1.name].overridesShorthands.indexOf(property2.name) > -1;
+}
+
+module.exports = overridesNonComponentShorthand;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/populate-components.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/populate-components.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/properties/populate-components.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,61 @@
+var configuration = require('../../configuration');
+var InvalidPropertyError = require('../../invalid-property-error');
+
+function populateComponents(properties, validator, warnings) {
+  var component;
+  var j, m;
+
+  for (var i = properties.length - 1; i >= 0; i--) {
+    var property = properties[i];
+    var descriptor = configuration[property.name];
+
+    if (!property.dynamic && descriptor && descriptor.shorthand) {
+      if (onlyValueIsVariable(property, validator) || moreThanOneValueIsVariable(property, validator)) {
+        property.optimizable = false;
+        continue;
+      }
+
+      property.shorthand = true;
+      property.dirty = true;
+
+      try {
+        property.components = descriptor.breakUp(property, configuration, validator);
+
+        if (descriptor.shorthandComponents) {
+          for (j = 0, m = property.components.length; j < m; j++) {
+            component = property.components[j];
+            component.components = configuration[component.name].breakUp(component, configuration, validator);
+          }
+        }
+      } catch (e) {
+        if (e instanceof InvalidPropertyError) {
+          property.components = []; // this will set property.unused to true below
+          warnings.push(e.message);
+        } else {
+          throw e;
+        }
+      }
+
+      if (property.components.length > 0) {
+        property.multiplex = property.components[0].multiplex;
+      } else {
+        property.unused = true;
+      }
+    }
+  }
+}
+
+function onlyValueIsVariable(property, validator) {
+  return property.value.length == 1 && validator.isVariable(property.value[0][1]);
+}
+
+function moreThanOneValueIsVariable(property, validator) {
+  return property.value.length > 1
+    && property.value.filter(
+      function(value) {
+        return validator.isVariable(value[1]);
+      }
+    ).length > 1;
+}
+
+module.exports = populateComponents;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/reduce-non-adjacent.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/reduce-non-adjacent.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/reduce-non-adjacent.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,174 @@
+var isMergeable = require('./is-mergeable');
+
+var optimizeProperties = require('./properties/optimize');
+
+var cloneArray = require('../../utils/clone-array');
+
+var Token = require('../../tokenizer/token');
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+function reduceNonAdjacent(tokens, context) {
+  var options = context.options;
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
+  var candidates = {};
+  var repeated = [];
+
+  for (var i = tokens.length - 1; i >= 0; i--) {
+    var token = tokens[i];
+
+    if (token[0] != Token.RULE) {
+      continue;
+    } else if (token[2].length === 0) {
+      continue;
+    }
+
+    var selectorAsString = serializeRules(token[1]);
+    var isComplexAndNotSpecial = token[1].length > 1
+      && isMergeable(selectorAsString, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging);
+    var wrappedSelectors = wrappedSelectorsFrom(token[1]);
+    var selectors = isComplexAndNotSpecial
+      ? [selectorAsString].concat(wrappedSelectors)
+      : [selectorAsString];
+
+    for (var j = 0, m = selectors.length; j < m; j++) {
+      var selector = selectors[j];
+
+      if (!candidates[selector]) { candidates[selector] = []; } else { repeated.push(selector); }
+
+      candidates[selector].push({
+        where: i,
+        list: wrappedSelectors,
+        isPartial: isComplexAndNotSpecial && j > 0,
+        isComplex: isComplexAndNotSpecial && j === 0
+      });
+    }
+  }
+
+  reduceSimpleNonAdjacentCases(tokens, repeated, candidates, options, context);
+  reduceComplexNonAdjacentCases(tokens, candidates, options, context);
+}
+
+function wrappedSelectorsFrom(list) {
+  var wrapped = [];
+
+  for (var i = 0; i < list.length; i++) {
+    wrapped.push([list[i][1]]);
+  }
+
+  return wrapped;
+}
+
+function reduceSimpleNonAdjacentCases(tokens, repeated, candidates, options, context) {
+  function filterOut(idx, bodies) {
+    return data[idx].isPartial && bodies.length === 0;
+  }
+
+  function reduceBody(token, newBody, processedCount, tokenIdx) {
+    if (!data[processedCount - tokenIdx - 1].isPartial) { token[2] = newBody; }
+  }
+
+  for (var i = 0, l = repeated.length; i < l; i++) {
+    var selector = repeated[i];
+    var data = candidates[selector];
+
+    reduceSelector(tokens, data, {
+      filterOut: filterOut,
+      callback: reduceBody
+    }, options, context);
+  }
+}
+
+function reduceComplexNonAdjacentCases(tokens, candidates, options, context) {
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
+  var localContext = {};
+
+  function filterOut(idx) {
+    return localContext.data[idx].where < localContext.intoPosition;
+  }
+
+  function collectReducedBodies(token, newBody, processedCount, tokenIdx) {
+    if (tokenIdx === 0) { localContext.reducedBodies.push(newBody); }
+  }
+
+  allSelectors:
+  for (var complexSelector in candidates) {
+    var into = candidates[complexSelector];
+    if (!into[0].isComplex) { continue; }
+
+    var intoPosition = into[into.length - 1].where;
+    var intoToken = tokens[intoPosition];
+    var reducedBodies = [];
+
+    var selectors = isMergeable(complexSelector, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging)
+      ? into[0].list
+      : [complexSelector];
+
+    localContext.intoPosition = intoPosition;
+    localContext.reducedBodies = reducedBodies;
+
+    for (var j = 0, m = selectors.length; j < m; j++) {
+      var selector = selectors[j];
+      var data = candidates[selector];
+
+      if (data.length < 2) { continue allSelectors; }
+
+      localContext.data = data;
+
+      reduceSelector(tokens, data, {
+        filterOut: filterOut,
+        callback: collectReducedBodies
+      }, options, context);
+
+      if (serializeBody(reducedBodies[reducedBodies.length - 1]) != serializeBody(reducedBodies[0])) {
+        continue allSelectors;
+      }
+    }
+
+    intoToken[2] = reducedBodies[0];
+  }
+}
+
+function reduceSelector(tokens, data, context, options, outerContext) {
+  var bodies = [];
+  var bodiesAsList = [];
+  var processedTokens = [];
+
+  for (var j = data.length - 1; j >= 0; j--) {
+    if (context.filterOut(j, bodies)) { continue; }
+
+    var where = data[j].where;
+    var token = tokens[where];
+    var clonedBody = cloneArray(token[2]);
+
+    bodies = bodies.concat(clonedBody);
+    bodiesAsList.push(clonedBody);
+    processedTokens.push(where);
+  }
+
+  optimizeProperties(bodies, true, false, outerContext);
+
+  var processedCount = processedTokens.length;
+  var propertyIdx = bodies.length - 1;
+  var tokenIdx = processedCount - 1;
+
+  while (tokenIdx >= 0) {
+    if ((tokenIdx === 0
+      || (bodies[propertyIdx] && bodiesAsList[tokenIdx].indexOf(bodies[propertyIdx]) > -1)) && propertyIdx > -1) {
+      propertyIdx--;
+      continue;
+    }
+
+    var newBody = bodies.splice(propertyIdx + 1);
+    context.callback(tokens[processedTokens[tokenIdx]], newBody, processedCount, tokenIdx);
+
+    tokenIdx--;
+  }
+}
+
+module.exports = reduceNonAdjacent;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-font-at-rules.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-font-at-rules.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-font-at-rules.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,30 @@
+var Token = require('../../tokenizer/token');
+
+var serializeAll = require('../../writer/one-time').all;
+
+var FONT_FACE_SCOPE = '@font-face';
+
+function removeDuplicateFontAtRules(tokens) {
+  var fontAtRules = [];
+  var token;
+  var key;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+
+    if (token[0] != Token.AT_RULE_BLOCK && token[1][0][1] != FONT_FACE_SCOPE) {
+      continue;
+    }
+
+    key = serializeAll([token]);
+
+    if (fontAtRules.indexOf(key) > -1) {
+      token[2] = [];
+    } else {
+      fontAtRules.push(key);
+    }
+  }
+}
+
+module.exports = removeDuplicateFontAtRules;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-media-queries.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-media-queries.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-media-queries.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,30 @@
+var Token = require('../../tokenizer/token');
+
+var serializeAll = require('../../writer/one-time').all;
+var serializeRules = require('../../writer/one-time').rules;
+
+function removeDuplicateMediaQueries(tokens) {
+  var candidates = {};
+  var candidate;
+  var token;
+  var key;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+    if (token[0] != Token.NESTED_BLOCK) {
+      continue;
+    }
+
+    key = serializeRules(token[1]) + '%' + serializeAll(token[2]);
+    candidate = candidates[key];
+
+    if (candidate) {
+      candidate[2] = [];
+    }
+
+    candidates[key] = token;
+  }
+}
+
+module.exports = removeDuplicateMediaQueries;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-duplicates.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-duplicates.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-duplicates.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,36 @@
+var Token = require('../../tokenizer/token');
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+function removeDuplicates(tokens) {
+  var matched = {};
+  var moreThanOnce = [];
+  var id, token;
+  var body, bodies;
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+    if (token[0] != Token.RULE) { continue; }
+
+    id = serializeRules(token[1]);
+
+    if (matched[id] && matched[id].length == 1) { moreThanOnce.push(id); } else { matched[id] = matched[id] || []; }
+
+    matched[id].push(i);
+  }
+
+  for (i = 0, l = moreThanOnce.length; i < l; i++) {
+    id = moreThanOnce[i];
+    bodies = [];
+
+    for (var j = matched[id].length - 1; j >= 0; j--) {
+      token = tokens[matched[id][j]];
+      body = serializeBody(token[2]);
+
+      if (bodies.indexOf(body) > -1) { token[2] = []; } else { bodies.push(body); }
+    }
+  }
+}
+
+module.exports = removeDuplicates;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-unused-at-rules.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-unused-at-rules.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/remove-unused-at-rules.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,249 @@
+var populateComponents = require('./properties/populate-components');
+
+var wrapForOptimizing = require('../wrap-for-optimizing').single;
+var restoreFromOptimizing = require('../restore-from-optimizing');
+
+var Token = require('../../tokenizer/token');
+
+var animationNameRegex = /^(-moz-|-o-|-webkit-)?animation-name$/;
+var animationRegex = /^(-moz-|-o-|-webkit-)?animation$/;
+var keyframeRegex = /^@(-moz-|-o-|-webkit-)?keyframes /;
+var importantRegex = /\s{0,31}!important$/;
+var optionalMatchingQuotesRegex = /^(['"]?)(.*)\1$/;
+
+function normalize(value) {
+  return value
+    .replace(optionalMatchingQuotesRegex, '$2')
+    .replace(importantRegex, '');
+}
+
+function removeUnusedAtRules(tokens, context) {
+  removeUnusedAtRule(tokens, matchCounterStyle, markCounterStylesAsUsed, context);
+  removeUnusedAtRule(tokens, matchFontFace, markFontFacesAsUsed, context);
+  removeUnusedAtRule(tokens, matchKeyframe, markKeyframesAsUsed, context);
+  removeUnusedAtRule(tokens, matchNamespace, markNamespacesAsUsed, context);
+}
+
+function removeUnusedAtRule(tokens, matchCallback, markCallback, context) {
+  var atRules = {};
+  var atRule;
+  var atRuleTokens;
+  var atRuleToken;
+  var zeroAt;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    matchCallback(tokens[i], atRules);
+  }
+
+  if (Object.keys(atRules).length === 0) {
+    return;
+  }
+
+  markUsedAtRules(tokens, markCallback, atRules, context);
+
+  for (atRule in atRules) {
+    atRuleTokens = atRules[atRule];
+
+    for (i = 0, l = atRuleTokens.length; i < l; i++) {
+      atRuleToken = atRuleTokens[i];
+      zeroAt = atRuleToken[0] == Token.AT_RULE ? 1 : 2;
+      atRuleToken[zeroAt] = [];
+    }
+  }
+}
+
+function markUsedAtRules(tokens, markCallback, atRules, context) {
+  var boundMarkCallback = markCallback(atRules);
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    switch (tokens[i][0]) {
+    case Token.RULE:
+      boundMarkCallback(tokens[i], context);
+      break;
+    case Token.NESTED_BLOCK:
+      markUsedAtRules(tokens[i][2], markCallback, atRules, context);
+    }
+  }
+}
+
+function matchCounterStyle(token, atRules) {
+  var match;
+
+  if (token[0] == Token.AT_RULE_BLOCK && token[1][0][1].indexOf('@counter-style') === 0) {
+    match = token[1][0][1].split(' ')[1];
+    atRules[match] = atRules[match] || [];
+    atRules[match].push(token);
+  }
+}
+
+function markCounterStylesAsUsed(atRules) {
+  return function(token, context) {
+    var property;
+    var wrappedProperty;
+    var i, l;
+
+    for (i = 0, l = token[2].length; i < l; i++) {
+      property = token[2][i];
+
+      if (property[1][1] == 'list-style') {
+        wrappedProperty = wrapForOptimizing(property);
+        populateComponents([wrappedProperty], context.validator, context.warnings);
+
+        if (wrappedProperty.components[0].value[0][1] in atRules) {
+          delete atRules[property[2][1]];
+        }
+
+        restoreFromOptimizing([wrappedProperty]);
+      }
+
+      if (property[1][1] == 'list-style-type' && property[2][1] in atRules) {
+        delete atRules[property[2][1]];
+      }
+    }
+  };
+}
+
+function matchFontFace(token, atRules) {
+  var property;
+  var match;
+  var i, l;
+
+  if (token[0] == Token.AT_RULE_BLOCK && token[1][0][1] == '@font-face') {
+    for (i = 0, l = token[2].length; i < l; i++) {
+      property = token[2][i];
+
+      if (property[1][1] == 'font-family') {
+        match = normalize(property[2][1].toLowerCase());
+        atRules[match] = atRules[match] || [];
+        atRules[match].push(token);
+        break;
+      }
+    }
+  }
+}
+
+function markFontFacesAsUsed(atRules) {
+  return function(token, context) {
+    var property;
+    var wrappedProperty;
+    var component;
+    var normalizedMatch;
+    var i, l;
+    var j, m;
+
+    for (i = 0, l = token[2].length; i < l; i++) {
+      property = token[2][i];
+
+      if (property[1][1] == 'font') {
+        wrappedProperty = wrapForOptimizing(property);
+        populateComponents([wrappedProperty], context.validator, context.warnings);
+        component = wrappedProperty.components[6];
+
+        for (j = 0, m = component.value.length; j < m; j++) {
+          normalizedMatch = normalize(component.value[j][1].toLowerCase());
+
+          if (normalizedMatch in atRules) {
+            delete atRules[normalizedMatch];
+          }
+        }
+
+        restoreFromOptimizing([wrappedProperty]);
+      }
+
+      if (property[1][1] == 'font-family') {
+        for (j = 2, m = property.length; j < m; j++) {
+          normalizedMatch = normalize(property[j][1].toLowerCase());
+
+          if (normalizedMatch in atRules) {
+            delete atRules[normalizedMatch];
+          }
+        }
+      }
+    }
+  };
+}
+
+function matchKeyframe(token, atRules) {
+  var match;
+
+  if (token[0] == Token.NESTED_BLOCK && keyframeRegex.test(token[1][0][1])) {
+    match = token[1][0][1].split(' ')[1];
+    atRules[match] = atRules[match] || [];
+    atRules[match].push(token);
+  }
+}
+
+function markKeyframesAsUsed(atRules) {
+  return function(token, context) {
+    var property;
+    var wrappedProperty;
+    var component;
+    var i, l;
+    var j, m;
+
+    for (i = 0, l = token[2].length; i < l; i++) {
+      property = token[2][i];
+
+      if (animationRegex.test(property[1][1])) {
+        wrappedProperty = wrapForOptimizing(property);
+        populateComponents([wrappedProperty], context.validator, context.warnings);
+        component = wrappedProperty.components[7];
+
+        for (j = 0, m = component.value.length; j < m; j++) {
+          if (component.value[j][1] in atRules) {
+            delete atRules[component.value[j][1]];
+          }
+        }
+
+        restoreFromOptimizing([wrappedProperty]);
+      }
+
+      if (animationNameRegex.test(property[1][1])) {
+        for (j = 2, m = property.length; j < m; j++) {
+          if (property[j][1] in atRules) {
+            delete atRules[property[j][1]];
+          }
+        }
+      }
+    }
+  };
+}
+
+function matchNamespace(token, atRules) {
+  var match;
+
+  if (token[0] == Token.AT_RULE && token[1].indexOf('@namespace') === 0) {
+    match = token[1].split(' ')[1];
+    atRules[match] = atRules[match] || [];
+    atRules[match].push(token);
+  }
+}
+
+function markNamespacesAsUsed(atRules) {
+  var namespaceRegex = new RegExp(Object.keys(atRules).join('\\||') + '\\|', 'g');
+
+  return function(token) {
+    var match;
+    var scope;
+    var normalizedMatch;
+    var i, l;
+    var j, m;
+
+    for (i = 0, l = token[1].length; i < l; i++) {
+      scope = token[1][i];
+      match = scope[1].match(namespaceRegex);
+
+      for (j = 0, m = match.length; j < m; j++) {
+        normalizedMatch = match[j].substring(0, match[j].length - 1);
+
+        if (normalizedMatch in atRules) {
+          delete atRules[normalizedMatch];
+        }
+      }
+    }
+  };
+}
+
+module.exports = removeUnusedAtRules;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/reorderable.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/reorderable.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/reorderable.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,93 @@
+// TODO: it'd be great to merge it with the other canReorder functionality
+
+var rulesOverlap = require('./rules-overlap');
+var specificitiesOverlap = require('./specificities-overlap');
+
+var FLEX_PROPERTIES = /align-items|box-align|box-pack|flex|justify/;
+var BORDER_PROPERTIES = /^border-(top|right|bottom|left|color|style|width|radius)/;
+
+function canReorder(left, right, cache) {
+  for (var i = right.length - 1; i >= 0; i--) {
+    for (var j = left.length - 1; j >= 0; j--) {
+      if (!canReorderSingle(left[j], right[i], cache)) { return false; }
+    }
+  }
+
+  return true;
+}
+
+function canReorderSingle(left, right, cache) {
+  var leftName = left[0];
+  var leftValue = left[1];
+  var leftNameRoot = left[2];
+  var leftSelector = left[5];
+  var leftInSpecificSelector = left[6];
+  var rightName = right[0];
+  var rightValue = right[1];
+  var rightNameRoot = right[2];
+  var rightSelector = right[5];
+  var rightInSpecificSelector = right[6];
+
+  if (leftName == 'font' && rightName == 'line-height' || rightName == 'font' && leftName == 'line-height') { return false; }
+  if (FLEX_PROPERTIES.test(leftName) && FLEX_PROPERTIES.test(rightName)) { return false; }
+  if (leftNameRoot == rightNameRoot
+    && unprefixed(leftName) == unprefixed(rightName)
+    && (vendorPrefixed(leftName) ^ vendorPrefixed(rightName))) { return false; }
+  if (leftNameRoot == 'border' && BORDER_PROPERTIES.test(rightNameRoot) && (leftName == 'border' || leftName == rightNameRoot || (leftValue != rightValue && sameBorderComponent(leftName, rightName)))) { return false; }
+  if (rightNameRoot == 'border' && BORDER_PROPERTIES.test(leftNameRoot) && (rightName == 'border' || rightName == leftNameRoot || (leftValue != rightValue && sameBorderComponent(leftName, rightName)))) { return false; }
+  if (leftNameRoot == 'border' && rightNameRoot == 'border' && leftName != rightName && (isSideBorder(leftName) && isStyleBorder(rightName) || isStyleBorder(leftName) && isSideBorder(rightName))) { return false; }
+  if (leftNameRoot != rightNameRoot) { return true; }
+  if (leftName == rightName
+    && leftNameRoot == rightNameRoot
+    && (leftValue == rightValue || withDifferentVendorPrefix(leftValue, rightValue))) { return true; }
+  if (leftName != rightName
+    && leftNameRoot == rightNameRoot
+    && leftName != leftNameRoot
+    && rightName != rightNameRoot) { return true; }
+  if (leftName != rightName
+    && leftNameRoot == rightNameRoot
+    && leftValue == rightValue) { return true; }
+  if (rightInSpecificSelector
+    && leftInSpecificSelector
+    && !inheritable(leftNameRoot)
+    && !inheritable(rightNameRoot)
+    && !rulesOverlap(rightSelector, leftSelector, false)) { return true; }
+  if (!specificitiesOverlap(leftSelector, rightSelector, cache)) { return true; }
+
+  return false;
+}
+
+function vendorPrefixed(name) {
+  return /^-(?:moz|webkit|ms|o)-/.test(name);
+}
+
+function unprefixed(name) {
+  return name.replace(/^-(?:moz|webkit|ms|o)-/, '');
+}
+
+function sameBorderComponent(name1, name2) {
+  return name1.split('-').pop() == name2.split('-').pop();
+}
+
+function isSideBorder(name) {
+  return name == 'border-top' || name == 'border-right' || name == 'border-bottom' || name == 'border-left';
+}
+
+function isStyleBorder(name) {
+  return name == 'border-color' || name == 'border-style' || name == 'border-width';
+}
+
+function withDifferentVendorPrefix(value1, value2) {
+  return vendorPrefixed(value1) && vendorPrefixed(value2) && value1.split('-')[1] != value2.split('-')[2];
+}
+
+function inheritable(name) {
+  // According to http://www.w3.org/TR/CSS21/propidx.html
+  // Others will be catched by other, preceeding rules
+  return name == 'font' || name == 'line-height' || name == 'list-style';
+}
+
+module.exports = {
+  canReorder: canReorder,
+  canReorderSingle: canReorderSingle
+};
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/restore-with-components.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/restore-with-components.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/restore-with-components.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,12 @@
+var configuration = require('../configuration');
+
+function restoreWithComponents(property) {
+  var descriptor = configuration[property.name];
+
+  if (descriptor && descriptor.shorthand) {
+    return descriptor.restore(property, configuration);
+  }
+  return property.value;
+}
+
+module.exports = restoreWithComponents;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/restructure.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/restructure.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/restructure.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,392 @@
+var canReorderSingle = require('./reorderable').canReorderSingle;
+var extractProperties = require('./extract-properties');
+var isMergeable = require('./is-mergeable');
+var tidyRuleDuplicates = require('./tidy-rule-duplicates');
+
+var Token = require('../../tokenizer/token');
+
+var cloneArray = require('../../utils/clone-array');
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+function naturalSorter(a, b) {
+  return a > b ? 1 : -1;
+}
+
+function cloneAndMergeSelectors(propertyA, propertyB) {
+  var cloned = cloneArray(propertyA);
+  cloned[5] = cloned[5].concat(propertyB[5]);
+
+  return cloned;
+}
+
+function restructure(tokens, context) {
+  var options = context.options;
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var mergeLimit = options.compatibility.selectors.mergeLimit;
+  var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
+  var specificityCache = context.cache.specificity;
+  var movableTokens = {};
+  var movedProperties = [];
+  var multiPropertyMoveCache = {};
+  var movedToBeDropped = [];
+  var maxCombinationsLevel = 2;
+  var ID_JOIN_CHARACTER = '%';
+
+  function sendToMultiPropertyMoveCache(position, movedProperty, allFits) {
+    for (var i = allFits.length - 1; i >= 0; i--) {
+      var fit = allFits[i][0];
+      var id = addToCache(movedProperty, fit);
+
+      if (multiPropertyMoveCache[id].length > 1 && processMultiPropertyMove(position, multiPropertyMoveCache[id])) {
+        removeAllMatchingFromCache(id);
+        break;
+      }
+    }
+  }
+
+  function addToCache(movedProperty, fit) {
+    var id = cacheId(fit);
+    multiPropertyMoveCache[id] = multiPropertyMoveCache[id] || [];
+    multiPropertyMoveCache[id].push([movedProperty, fit]);
+    return id;
+  }
+
+  function removeAllMatchingFromCache(matchId) {
+    var matchSelectors = matchId.split(ID_JOIN_CHARACTER);
+    var forRemoval = [];
+    var i;
+
+    for (var id in multiPropertyMoveCache) {
+      var selectors = id.split(ID_JOIN_CHARACTER);
+      for (i = selectors.length - 1; i >= 0; i--) {
+        if (matchSelectors.indexOf(selectors[i]) > -1) {
+          forRemoval.push(id);
+          break;
+        }
+      }
+    }
+
+    for (i = forRemoval.length - 1; i >= 0; i--) {
+      delete multiPropertyMoveCache[forRemoval[i]];
+    }
+  }
+
+  function cacheId(cachedTokens) {
+    var id = [];
+    for (var i = 0, l = cachedTokens.length; i < l; i++) {
+      id.push(serializeRules(cachedTokens[i][1]));
+    }
+    return id.join(ID_JOIN_CHARACTER);
+  }
+
+  function tokensToMerge(sourceTokens) {
+    var uniqueTokensWithBody = [];
+    var mergeableTokens = [];
+
+    for (var i = sourceTokens.length - 1; i >= 0; i--) {
+      if (!isMergeable(
+        serializeRules(sourceTokens[i][1]),
+        mergeablePseudoClasses,
+        mergeablePseudoElements,
+        multiplePseudoMerging
+      )) {
+        continue;
+      }
+
+      mergeableTokens.unshift(sourceTokens[i]);
+      if (sourceTokens[i][2].length > 0
+        && uniqueTokensWithBody.indexOf(sourceTokens[i]) == -1) {
+        uniqueTokensWithBody.push(sourceTokens[i]);
+      }
+    }
+
+    return uniqueTokensWithBody.length > 1
+      ? mergeableTokens
+      : [];
+  }
+
+  function shortenIfPossible(position, movedProperty) {
+    var name = movedProperty[0];
+    var value = movedProperty[1];
+    var key = movedProperty[4];
+    var valueSize = name.length + value.length + 1;
+    var allSelectors = [];
+    var qualifiedTokens = [];
+
+    var mergeableTokens = tokensToMerge(movableTokens[key]);
+    if (mergeableTokens.length < 2) { return; }
+
+    var allFits = findAllFits(mergeableTokens, valueSize, 1);
+    var bestFit = allFits[0];
+    if (bestFit[1] > 0) { return sendToMultiPropertyMoveCache(position, movedProperty, allFits); }
+
+    for (var i = bestFit[0].length - 1; i >= 0; i--) {
+      allSelectors = bestFit[0][i][1].concat(allSelectors);
+      qualifiedTokens.unshift(bestFit[0][i]);
+    }
+
+    allSelectors = tidyRuleDuplicates(allSelectors);
+    dropAsNewTokenAt(position, [movedProperty], allSelectors, qualifiedTokens);
+  }
+
+  function fitSorter(fit1, fit2) {
+    return fit1[1] > fit2[1] ? 1 : (fit1[1] == fit2[1] ? 0 : -1);
+  }
+
+  function findAllFits(mergeableTokens, propertySize, propertiesCount) {
+    var combinations = allCombinations(mergeableTokens, propertySize, propertiesCount, maxCombinationsLevel - 1);
+    return combinations.sort(fitSorter);
+  }
+
+  function allCombinations(tokensVariant, propertySize, propertiesCount, level) {
+    var differenceVariants = [[tokensVariant, sizeDifference(tokensVariant, propertySize, propertiesCount)]];
+    if (tokensVariant.length > 2 && level > 0) {
+      for (var i = tokensVariant.length - 1; i >= 0; i--) {
+        var subVariant = Array.prototype.slice.call(tokensVariant, 0);
+        subVariant.splice(i, 1);
+        differenceVariants = differenceVariants.concat(
+          allCombinations(subVariant, propertySize, propertiesCount, level - 1)
+        );
+      }
+    }
+
+    return differenceVariants;
+  }
+
+  function sizeDifference(tokensVariant, propertySize, propertiesCount) {
+    var allSelectorsSize = 0;
+    for (var i = tokensVariant.length - 1; i >= 0; i--) {
+      allSelectorsSize += tokensVariant[i][2].length > propertiesCount
+        ? serializeRules(tokensVariant[i][1]).length
+        : -1;
+    }
+    return allSelectorsSize - (tokensVariant.length - 1) * propertySize + 1;
+  }
+
+  function dropAsNewTokenAt(position, properties, allSelectors, mergeableTokens) {
+    var i, j, k, m;
+    var allProperties = [];
+
+    for (i = mergeableTokens.length - 1; i >= 0; i--) {
+      var mergeableToken = mergeableTokens[i];
+
+      for (j = mergeableToken[2].length - 1; j >= 0; j--) {
+        var mergeableProperty = mergeableToken[2][j];
+
+        for (k = 0, m = properties.length; k < m; k++) {
+          var property = properties[k];
+
+          var mergeablePropertyName = mergeableProperty[1][1];
+          var propertyName = property[0];
+          var propertyBody = property[4];
+          if (mergeablePropertyName == propertyName && serializeBody([mergeableProperty]) == propertyBody) {
+            mergeableToken[2].splice(j, 1);
+            break;
+          }
+        }
+      }
+    }
+
+    for (i = properties.length - 1; i >= 0; i--) {
+      allProperties.unshift(properties[i][3]);
+    }
+
+    var newToken = [Token.RULE, allSelectors, allProperties];
+    tokens.splice(position, 0, newToken);
+  }
+
+  function dropPropertiesAt(position, movedProperty) {
+    var key = movedProperty[4];
+    var toMove = movableTokens[key];
+
+    if (toMove && toMove.length > 1) {
+      if (!shortenMultiMovesIfPossible(position, movedProperty)) { shortenIfPossible(position, movedProperty); }
+    }
+  }
+
+  function shortenMultiMovesIfPossible(position, movedProperty) {
+    var candidates = [];
+    var propertiesAndMergableTokens = [];
+    var key = movedProperty[4];
+    var j, k;
+
+    var mergeableTokens = tokensToMerge(movableTokens[key]);
+    if (mergeableTokens.length < 2) { return; }
+
+    movableLoop:
+    for (var value in movableTokens) {
+      var tokensList = movableTokens[value];
+
+      for (j = mergeableTokens.length - 1; j >= 0; j--) {
+        if (tokensList.indexOf(mergeableTokens[j]) == -1) { continue movableLoop; }
+      }
+
+      candidates.push(value);
+    }
+
+    if (candidates.length < 2) { return false; }
+
+    for (j = candidates.length - 1; j >= 0; j--) {
+      for (k = movedProperties.length - 1; k >= 0; k--) {
+        if (movedProperties[k][4] == candidates[j]) {
+          propertiesAndMergableTokens.unshift([movedProperties[k], mergeableTokens]);
+          break;
+        }
+      }
+    }
+
+    return processMultiPropertyMove(position, propertiesAndMergableTokens);
+  }
+
+  function processMultiPropertyMove(position, propertiesAndMergableTokens) {
+    var valueSize = 0;
+    var properties = [];
+    var property;
+
+    for (var i = propertiesAndMergableTokens.length - 1; i >= 0; i--) {
+      property = propertiesAndMergableTokens[i][0];
+      var fullValue = property[4];
+      valueSize += fullValue.length + (i > 0 ? 1 : 0);
+
+      properties.push(property);
+    }
+
+    var mergeableTokens = propertiesAndMergableTokens[0][1];
+    var bestFit = findAllFits(mergeableTokens, valueSize, properties.length)[0];
+    if (bestFit[1] > 0) { return false; }
+
+    var allSelectors = [];
+    var qualifiedTokens = [];
+    for (i = bestFit[0].length - 1; i >= 0; i--) {
+      allSelectors = bestFit[0][i][1].concat(allSelectors);
+      qualifiedTokens.unshift(bestFit[0][i]);
+    }
+
+    allSelectors = tidyRuleDuplicates(allSelectors);
+    dropAsNewTokenAt(position, properties, allSelectors, qualifiedTokens);
+
+    for (i = properties.length - 1; i >= 0; i--) {
+      property = properties[i];
+      var index = movedProperties.indexOf(property);
+
+      delete movableTokens[property[4]];
+
+      if (index > -1 && movedToBeDropped.indexOf(index) == -1) { movedToBeDropped.push(index); }
+    }
+
+    return true;
+  }
+
+  function boundToAnotherPropertyInCurrrentToken(property, movedProperty, token) {
+    var propertyName = property[0];
+    var movedPropertyName = movedProperty[0];
+    if (propertyName != movedPropertyName) { return false; }
+
+    var key = movedProperty[4];
+    var toMove = movableTokens[key];
+    return toMove && toMove.indexOf(token) > -1;
+  }
+
+  for (var i = tokens.length - 1; i >= 0; i--) {
+    var token = tokens[i];
+    var isRule;
+    var j, k, m;
+    var samePropertyAt;
+
+    if (token[0] == Token.RULE) {
+      isRule = true;
+    } else if (token[0] == Token.NESTED_BLOCK) {
+      isRule = false;
+    } else {
+      continue;
+    }
+
+    // We cache movedProperties.length as it may change in the loop
+    var movedCount = movedProperties.length;
+
+    var properties = extractProperties(token);
+    movedToBeDropped = [];
+
+    var unmovableInCurrentToken = [];
+    for (j = properties.length - 1; j >= 0; j--) {
+      for (k = j - 1; k >= 0; k--) {
+        if (!canReorderSingle(properties[j], properties[k], specificityCache)) {
+          unmovableInCurrentToken.push(j);
+          break;
+        }
+      }
+    }
+
+    for (j = properties.length - 1; j >= 0; j--) {
+      var property = properties[j];
+      var movedSameProperty = false;
+
+      for (k = 0; k < movedCount; k++) {
+        var movedProperty = movedProperties[k];
+
+        if (movedToBeDropped.indexOf(k) == -1 && (
+          !canReorderSingle(property, movedProperty, specificityCache)
+          && !boundToAnotherPropertyInCurrrentToken(property, movedProperty, token)
+          || movableTokens[movedProperty[4]] && movableTokens[movedProperty[4]].length === mergeLimit)
+        ) {
+          dropPropertiesAt(i + 1, movedProperty);
+
+          if (movedToBeDropped.indexOf(k) == -1) {
+            movedToBeDropped.push(k);
+            delete movableTokens[movedProperty[4]];
+          }
+        }
+
+        if (!movedSameProperty) {
+          movedSameProperty = property[0] == movedProperty[0] && property[1] == movedProperty[1];
+
+          if (movedSameProperty) {
+            samePropertyAt = k;
+          }
+        }
+      }
+
+      if (!isRule || unmovableInCurrentToken.indexOf(j) > -1) { continue; }
+
+      var key = property[4];
+
+      if (movedSameProperty && movedProperties[samePropertyAt][5].length + property[5].length > mergeLimit) {
+        dropPropertiesAt(i + 1, movedProperties[samePropertyAt]);
+        movedProperties.splice(samePropertyAt, 1);
+        movableTokens[key] = [token];
+        movedSameProperty = false;
+      } else {
+        movableTokens[key] = movableTokens[key] || [];
+        movableTokens[key].push(token);
+      }
+
+      if (movedSameProperty) {
+        movedProperties[samePropertyAt] = cloneAndMergeSelectors(movedProperties[samePropertyAt], property);
+      } else {
+        movedProperties.push(property);
+      }
+    }
+
+    movedToBeDropped = movedToBeDropped.sort(naturalSorter);
+    for (j = 0, m = movedToBeDropped.length; j < m; j++) {
+      var dropAt = movedToBeDropped[j] - j;
+      movedProperties.splice(dropAt, 1);
+    }
+  }
+
+  var position = tokens[0] && tokens[0][0] == Token.AT_RULE && tokens[0][1].indexOf('@charset') === 0 ? 1 : 0;
+  for (; position < tokens.length - 1; position++) {
+    var isImportRule = tokens[position][0] === Token.AT_RULE && tokens[position][1].indexOf('@import') === 0;
+    var isComment = tokens[position][0] === Token.COMMENT;
+    if (!(isImportRule || isComment)) { break; }
+  }
+
+  for (i = 0; i < movedProperties.length; i++) {
+    dropPropertiesAt(position, movedProperties[i]);
+  }
+}
+
+module.exports = restructure;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/rules-overlap.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/rules-overlap.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/rules-overlap.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,32 @@
+var MODIFIER_PATTERN = /--.+$/;
+
+function rulesOverlap(rule1, rule2, bemMode) {
+  var scope1;
+  var scope2;
+  var i, l;
+  var j, m;
+
+  for (i = 0, l = rule1.length; i < l; i++) {
+    scope1 = rule1[i][1];
+
+    for (j = 0, m = rule2.length; j < m; j++) {
+      scope2 = rule2[j][1];
+
+      if (scope1 == scope2) {
+        return true;
+      }
+
+      if (bemMode && withoutModifiers(scope1) == withoutModifiers(scope2)) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+function withoutModifiers(scope) {
+  return scope.replace(MODIFIER_PATTERN, '');
+}
+
+module.exports = rulesOverlap;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/specificities-overlap.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/specificities-overlap.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/specificities-overlap.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,36 @@
+var specificity = require('./specificity');
+
+function specificitiesOverlap(selector1, selector2, cache) {
+  var specificity1;
+  var specificity2;
+  var i, l;
+  var j, m;
+
+  for (i = 0, l = selector1.length; i < l; i++) {
+    specificity1 = findSpecificity(selector1[i][1], cache);
+
+    for (j = 0, m = selector2.length; j < m; j++) {
+      specificity2 = findSpecificity(selector2[j][1], cache);
+
+      if (specificity1[0] === specificity2[0]
+        && specificity1[1] === specificity2[1]
+        && specificity1[2] === specificity2[2]) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+function findSpecificity(selector, cache) {
+  var value;
+
+  if (!(selector in cache)) {
+    cache[selector] = value = specificity(selector);
+  }
+
+  return value || cache[selector];
+}
+
+module.exports = specificitiesOverlap;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/specificity.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/specificity.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/specificity.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,77 @@
+var Marker = require('../../tokenizer/marker');
+
+var Selector = {
+  ADJACENT_SIBLING: '+',
+  DESCENDANT: '>',
+  DOT: '.',
+  HASH: '#',
+  NON_ADJACENT_SIBLING: '~',
+  PSEUDO: ':'
+};
+
+var LETTER_PATTERN = /[a-zA-Z]/;
+var NOT_PREFIX = ':not(';
+var SEPARATOR_PATTERN = /[\s,(>~+]/;
+
+function specificity(selector) {
+  var result = [0, 0, 0];
+  var character;
+  var isEscaped;
+  var isSingleQuoted;
+  var isDoubleQuoted;
+  var roundBracketLevel = 0;
+  var couldIntroduceNewTypeSelector;
+  var withinNotPseudoClass = false;
+  var wasPseudoClass = false;
+  var i, l;
+
+  for (i = 0, l = selector.length; i < l; i++) {
+    character = selector[i];
+
+    if (isEscaped) {
+      // noop
+    } else if (character == Marker.SINGLE_QUOTE && !isDoubleQuoted && !isSingleQuoted) {
+      isSingleQuoted = true;
+    } else if (character == Marker.SINGLE_QUOTE && !isDoubleQuoted && isSingleQuoted) {
+      isSingleQuoted = false;
+    } else if (character == Marker.DOUBLE_QUOTE && !isDoubleQuoted && !isSingleQuoted) {
+      isDoubleQuoted = true;
+    } else if (character == Marker.DOUBLE_QUOTE && isDoubleQuoted && !isSingleQuoted) {
+      isDoubleQuoted = false;
+    } else if (isSingleQuoted || isDoubleQuoted) {
+      continue;
+    } else if (roundBracketLevel > 0 && !withinNotPseudoClass) {
+      // noop
+    } else if (character == Marker.OPEN_ROUND_BRACKET) {
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && roundBracketLevel == 1) {
+      roundBracketLevel--;
+      withinNotPseudoClass = false;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET) {
+      roundBracketLevel--;
+    } else if (character == Selector.HASH) {
+      result[0]++;
+    } else if (character == Selector.DOT || character == Marker.OPEN_SQUARE_BRACKET) {
+      result[1]++;
+    } else if (character == Selector.PSEUDO && !wasPseudoClass && !isNotPseudoClass(selector, i)) {
+      result[1]++;
+      withinNotPseudoClass = false;
+    } else if (character == Selector.PSEUDO) {
+      withinNotPseudoClass = true;
+    } else if ((i === 0 || couldIntroduceNewTypeSelector) && LETTER_PATTERN.test(character)) {
+      result[2]++;
+    }
+
+    isEscaped = character == Marker.BACK_SLASH;
+    wasPseudoClass = character == Selector.PSEUDO;
+    couldIntroduceNewTypeSelector = !isEscaped && SEPARATOR_PATTERN.test(character);
+  }
+
+  return result;
+}
+
+function isNotPseudoClass(selector, index) {
+  return selector.indexOf(NOT_PREFIX, index) === index;
+}
+
+module.exports = specificity;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/tidy-rule-duplicates.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/tidy-rule-duplicates.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/level-2/tidy-rule-duplicates.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,21 @@
+function ruleSorter(s1, s2) {
+  return s1[1] > s2[1] ? 1 : -1;
+}
+
+function tidyRuleDuplicates(rules) {
+  var list = [];
+  var repeated = [];
+
+  for (var i = 0, l = rules.length; i < l; i++) {
+    var rule = rules[i];
+
+    if (repeated.indexOf(rule[1]) == -1) {
+      repeated.push(rule[1]);
+      list.push(rule);
+    }
+  }
+
+  return list.sort(ruleSorter);
+}
+
+module.exports = tidyRuleDuplicates;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/remove-unused.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/remove-unused.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/remove-unused.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,11 @@
+function removeUnused(properties) {
+  for (var i = properties.length - 1; i >= 0; i--) {
+    var property = properties[i];
+
+    if (property.unused) {
+      property.all.splice(property.position, 1);
+    }
+  }
+}
+
+module.exports = removeUnused;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/restore-from-optimizing.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/restore-from-optimizing.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/restore-from-optimizing.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,78 @@
+var Hack = require('./hack');
+
+var Marker = require('../tokenizer/marker');
+
+var ASTERISK_HACK = '*';
+var BACKSLASH_HACK = '\\';
+var IMPORTANT_TOKEN = '!important';
+var UNDERSCORE_HACK = '_';
+var BANG_HACK = '!ie';
+
+function restoreFromOptimizing(properties, restoreCallback) {
+  var property;
+  var restored;
+  var current;
+  var i;
+
+  for (i = properties.length - 1; i >= 0; i--) {
+    property = properties[i];
+
+    if (property.dynamic && property.important) {
+      restoreImportant(property);
+      continue;
+    }
+
+    if (property.dynamic) {
+      continue;
+    }
+
+    if (property.unused) {
+      continue;
+    }
+
+    if (!property.dirty && !property.important && !property.hack) {
+      continue;
+    }
+
+    if (property.optimizable && restoreCallback) {
+      restored = restoreCallback(property);
+      property.value = restored;
+    } else {
+      restored = property.value;
+    }
+
+    if (property.important) {
+      restoreImportant(property);
+    }
+
+    if (property.hack) {
+      restoreHack(property);
+    }
+
+    if ('all' in property) {
+      current = property.all[property.position];
+      current[1][1] = property.name;
+
+      current.splice(2, current.length - 1);
+      Array.prototype.push.apply(current, restored);
+    }
+  }
+}
+
+function restoreImportant(property) {
+  property.value[property.value.length - 1][1] += IMPORTANT_TOKEN;
+}
+
+function restoreHack(property) {
+  if (property.hack[0] == Hack.UNDERSCORE) {
+    property.name = UNDERSCORE_HACK + property.name;
+  } else if (property.hack[0] == Hack.ASTERISK) {
+    property.name = ASTERISK_HACK + property.name;
+  } else if (property.hack[0] == Hack.BACKSLASH) {
+    property.value[property.value.length - 1][1] += BACKSLASH_HACK + property.hack[1];
+  } else if (property.hack[0] == Hack.BANG) {
+    property.value[property.value.length - 1][1] += Marker.SPACE + BANG_HACK;
+  }
+}
+
+module.exports = restoreFromOptimizing;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/validator.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/validator.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/validator.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,561 @@
+var functionNoVendorRegexStr = '[A-Z]+(\\-|[A-Z]|[0-9])+\\(.*?\\)';
+var functionVendorRegexStr = '\\-(\\-|[A-Z]|[0-9])+\\(.*?\\)';
+var variableRegexStr = 'var\\(\\-\\-[^\\)]+\\)';
+var functionAnyRegexStr = '(' + variableRegexStr + '|' + functionNoVendorRegexStr + '|' + functionVendorRegexStr + ')';
+
+var calcRegex = new RegExp('^(\\-moz\\-|\\-webkit\\-)?calc\\([^\\)]+\\)$', 'i');
+var decimalRegex = /[0-9]/;
+var functionAnyRegex = new RegExp('^' + functionAnyRegexStr + '$', 'i');
+var hexAlphaColorRegex = /^#(?:[0-9a-f]{4}|[0-9a-f]{8})$/i;
+// eslint-disable-next-line max-len
+var hslColorRegex = /^hsl\(\s{0,31}[-.]?\d+\s{0,31},\s{0,31}\d*\.?\d+%\s{0,31},\s{0,31}\d*\.?\d+%\s{0,31}\)|hsla\(\s{0,31}[-.]?\d+\s{0,31},\s{0,31}\d*\.?\d+%\s{0,31},\s{0,31}\d*\.?\d+%\s{0,31},\s{0,31}\.?\d+\s{0,31}\)$/;
+// eslint-disable-next-line max-len
+var hslColorWithSpacesRegex = /^hsl\(\s{0,31}[-.]?\d+(deg)?\s{1,31}\d*\.?\d+%\s{1,31}\d*\.?\d+%\s{0,31}\)|hsla\(\s{0,31}[-.]?\d+(deg)?\s{1,31}\d*\.?\d+%\s{1,31}\d*\.?\d+%\s{1,31}\/\s{1,31}\d*\.?\d+%?\s{0,31}\)$/;
+var identifierRegex = /^(-[a-z0-9_][a-z0-9\-_]*|[a-z_][a-z0-9\-_]*)$/i;
+var namedEntityRegex = /^[a-z]+$/i;
+var prefixRegex = /^-([a-z0-9]|-)*$/i;
+var quotedTextRegex = /^("[^"]*"|'[^']*')$/i;
+// eslint-disable-next-line max-len
+var rgbColorRegex = /^rgb\(\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[\d]{1,3}\s{0,31}\)|rgba\(\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[\d]{1,3}\s{0,31},\s{0,31}[.\d]+\s{0,31}\)$/i;
+// eslint-disable-next-line max-len
+var rgbColorWithSpacesRegex = /^rgb\(\s{0,31}[\d]{1,3}\s{1,31}[\d]{1,3}\s{1,31}[\d]{1,3}\s{0,31}\)|rgba\(\s{0,31}[\d]{1,3}\s{1,31}[\d]{1,3}\s{1,31}[\d]{1,3}\s{1,31}\/\s{1,31}[\d]*\.?[.\d]+%?\s{0,31}\)$/i;
+var timeUnitPattern = /\d+(s|ms)/;
+var timingFunctionRegex = /^(cubic-bezier|steps)\([^)]+\)$/;
+var validTimeUnits = ['ms', 's'];
+var urlRegex = /^url\([\s\S]+\)$/i;
+var variableRegex = new RegExp('^' + variableRegexStr + '$', 'i');
+
+var eightValueColorRegex = /^#[0-9a-f]{8}$/i;
+var fourValueColorRegex = /^#[0-9a-f]{4}$/i;
+var sixValueColorRegex = /^#[0-9a-f]{6}$/i;
+var threeValueColorRegex = /^#[0-9a-f]{3}$/i;
+
+var DECIMAL_DOT = '.';
+var MINUS_SIGN = '-';
+var PLUS_SIGN = '+';
+
+var Keywords = {
+  '^': [
+    'inherit',
+    'initial',
+    'unset'
+  ],
+  '*-style': [
+    'auto',
+    'dashed',
+    'dotted',
+    'double',
+    'groove',
+    'hidden',
+    'inset',
+    'none',
+    'outset',
+    'ridge',
+    'solid'
+  ],
+  '*-timing-function': [
+    'ease',
+    'ease-in',
+    'ease-in-out',
+    'ease-out',
+    'linear',
+    'step-end',
+    'step-start'
+  ],
+  'animation-direction': [
+    'alternate',
+    'alternate-reverse',
+    'normal',
+    'reverse'
+  ],
+  'animation-fill-mode': [
+    'backwards',
+    'both',
+    'forwards',
+    'none'
+  ],
+  'animation-iteration-count': [
+    'infinite'
+  ],
+  'animation-name': [
+    'none'
+  ],
+  'animation-play-state': [
+    'paused',
+    'running'
+  ],
+  'background-attachment': [
+    'fixed',
+    'inherit',
+    'local',
+    'scroll'
+  ],
+  'background-clip': [
+    'border-box',
+    'content-box',
+    'inherit',
+    'padding-box',
+    'text'
+  ],
+  'background-origin': [
+    'border-box',
+    'content-box',
+    'inherit',
+    'padding-box'
+  ],
+  'background-position': [
+    'bottom',
+    'center',
+    'left',
+    'right',
+    'top'
+  ],
+  'background-repeat': [
+    'no-repeat',
+    'inherit',
+    'repeat',
+    'repeat-x',
+    'repeat-y',
+    'round',
+    'space'
+  ],
+  'background-size': [
+    'auto',
+    'cover',
+    'contain'
+  ],
+  'border-collapse': [
+    'collapse',
+    'inherit',
+    'separate'
+  ],
+  bottom: [
+    'auto'
+  ],
+  clear: [
+    'both',
+    'left',
+    'none',
+    'right'
+  ],
+  color: [
+    'transparent'
+  ],
+  cursor: [
+    'all-scroll',
+    'auto',
+    'col-resize',
+    'crosshair',
+    'default',
+    'e-resize',
+    'help',
+    'move',
+    'n-resize',
+    'ne-resize',
+    'no-drop',
+    'not-allowed',
+    'nw-resize',
+    'pointer',
+    'progress',
+    'row-resize',
+    's-resize',
+    'se-resize',
+    'sw-resize',
+    'text',
+    'vertical-text',
+    'w-resize',
+    'wait'
+  ],
+  display: [
+    'block',
+    'inline',
+    'inline-block',
+    'inline-table',
+    'list-item',
+    'none',
+    'table',
+    'table-caption',
+    'table-cell',
+    'table-column',
+    'table-column-group',
+    'table-footer-group',
+    'table-header-group',
+    'table-row',
+    'table-row-group'
+  ],
+  float: [
+    'left',
+    'none',
+    'right'
+  ],
+  left: [
+    'auto'
+  ],
+  font: [
+    'caption',
+    'icon',
+    'menu',
+    'message-box',
+    'small-caption',
+    'status-bar',
+    'unset'
+  ],
+  'font-size': [
+    'large',
+    'larger',
+    'medium',
+    'small',
+    'smaller',
+    'x-large',
+    'x-small',
+    'xx-large',
+    'xx-small'
+  ],
+  'font-stretch': [
+    'condensed',
+    'expanded',
+    'extra-condensed',
+    'extra-expanded',
+    'normal',
+    'semi-condensed',
+    'semi-expanded',
+    'ultra-condensed',
+    'ultra-expanded'
+  ],
+  'font-style': [
+    'italic',
+    'normal',
+    'oblique'
+  ],
+  'font-variant': [
+    'normal',
+    'small-caps'
+  ],
+  'font-weight': [
+    '100',
+    '200',
+    '300',
+    '400',
+    '500',
+    '600',
+    '700',
+    '800',
+    '900',
+    'bold',
+    'bolder',
+    'lighter',
+    'normal'
+  ],
+  'line-height': [
+    'normal'
+  ],
+  'list-style-position': [
+    'inside',
+    'outside'
+  ],
+  'list-style-type': [
+    'armenian',
+    'circle',
+    'decimal',
+    'decimal-leading-zero',
+    'disc',
+    'decimal|disc', // this is the default value of list-style-type, see comment in configuration.js
+    'georgian',
+    'lower-alpha',
+    'lower-greek',
+    'lower-latin',
+    'lower-roman',
+    'none',
+    'square',
+    'upper-alpha',
+    'upper-latin',
+    'upper-roman'
+  ],
+  overflow: [
+    'auto',
+    'hidden',
+    'scroll',
+    'visible'
+  ],
+  position: [
+    'absolute',
+    'fixed',
+    'relative',
+    'static'
+  ],
+  right: [
+    'auto'
+  ],
+  'text-align': [
+    'center',
+    'justify',
+    'left',
+    'left|right', // this is the default value of list-style-type, see comment in configuration.js
+    'right'
+  ],
+  'text-decoration': [
+    'line-through',
+    'none',
+    'overline',
+    'underline'
+  ],
+  'text-overflow': [
+    'clip',
+    'ellipsis'
+  ],
+  top: [
+    'auto'
+  ],
+  'vertical-align': [
+    'baseline',
+    'bottom',
+    'middle',
+    'sub',
+    'super',
+    'text-bottom',
+    'text-top',
+    'top'
+  ],
+  visibility: [
+    'collapse',
+    'hidden',
+    'visible'
+  ],
+  'white-space': [
+    'normal',
+    'nowrap',
+    'pre'
+  ],
+  width: [
+    'inherit',
+    'initial',
+    'medium',
+    'thick',
+    'thin'
+  ]
+};
+
+var Units = [
+  '%',
+  'ch',
+  'cm',
+  'em',
+  'ex',
+  'in',
+  'mm',
+  'pc',
+  'pt',
+  'px',
+  'rem',
+  'vh',
+  'vm',
+  'vmax',
+  'vmin',
+  'vw'
+];
+
+function isColor(value) {
+  return value != 'auto'
+    && (
+      isKeyword('color')(value)
+      || isHexColor(value)
+      || isColorFunction(value)
+      || isNamedEntity(value)
+    );
+}
+
+function isColorFunction(value) {
+  return isRgbColor(value) || isHslColor(value);
+}
+
+function isDynamicUnit(value) {
+  return calcRegex.test(value);
+}
+
+function isFunction(value) {
+  return functionAnyRegex.test(value);
+}
+
+function isHexColor(value) {
+  return threeValueColorRegex.test(value)
+    || fourValueColorRegex.test(value)
+    || sixValueColorRegex.test(value)
+    || eightValueColorRegex.test(value);
+}
+
+function isHslColor(value) {
+  return hslColorRegex.test(value) || hslColorWithSpacesRegex.test(value);
+}
+
+function isHexAlphaColor(value) {
+  return hexAlphaColorRegex.test(value);
+}
+
+function isIdentifier(value) {
+  return identifierRegex.test(value);
+}
+
+function isQuotedText(value) {
+  return quotedTextRegex.test(value);
+}
+
+function isImage(value) {
+  return value == 'none' || value == 'inherit' || isUrl(value);
+}
+
+function isKeyword(propertyName) {
+  return function(value) {
+    return Keywords[propertyName].indexOf(value) > -1;
+  };
+}
+
+function isNamedEntity(value) {
+  return namedEntityRegex.test(value);
+}
+
+function isNumber(value) {
+  return scanForNumber(value) == value.length;
+}
+
+function isRgbColor(value) {
+  return rgbColorRegex.test(value) || rgbColorWithSpacesRegex.test(value);
+}
+
+function isPrefixed(value) {
+  return prefixRegex.test(value);
+}
+
+function isPositiveNumber(value) {
+  return isNumber(value)
+    && parseFloat(value) >= 0;
+}
+
+function isVariable(value) {
+  return variableRegex.test(value);
+}
+
+function isTime(value) {
+  var numberUpTo = scanForNumber(value);
+
+  return numberUpTo == value.length && parseInt(value) === 0
+    || numberUpTo > -1 && validTimeUnits.indexOf(value.slice(numberUpTo + 1)) > -1
+    || isCalculatedTime(value);
+}
+
+function isCalculatedTime(value) {
+  return isFunction(value) && timeUnitPattern.test(value);
+}
+
+function isTimingFunction() {
+  var isTimingFunctionKeyword = isKeyword('*-timing-function');
+
+  return function(value) {
+    return isTimingFunctionKeyword(value) || timingFunctionRegex.test(value);
+  };
+}
+
+function isUnit(validUnits, value) {
+  var numberUpTo = scanForNumber(value);
+
+  return numberUpTo == value.length && parseInt(value) === 0
+    || numberUpTo > -1 && validUnits.indexOf(value.slice(numberUpTo + 1).toLowerCase()) > -1
+    || value == 'auto'
+    || value == 'inherit';
+}
+
+function isUrl(value) {
+  return urlRegex.test(value);
+}
+
+function isZIndex(value) {
+  return value == 'auto'
+    || isNumber(value)
+    || isKeyword('^')(value);
+}
+
+function scanForNumber(value) {
+  var hasDot = false;
+  var hasSign = false;
+  var character;
+  var i, l;
+
+  for (i = 0, l = value.length; i < l; i++) {
+    character = value[i];
+
+    if (i === 0 && (character == PLUS_SIGN || character == MINUS_SIGN)) {
+      hasSign = true;
+    } else if (i > 0 && hasSign && (character == PLUS_SIGN || character == MINUS_SIGN)) {
+      return i - 1;
+    } else if (character == DECIMAL_DOT && !hasDot) {
+      hasDot = true;
+    } else if (character == DECIMAL_DOT && hasDot) {
+      return i - 1;
+    } else if (decimalRegex.test(character)) {
+      continue;
+    } else {
+      return i - 1;
+    }
+  }
+
+  return i;
+}
+
+function validator(compatibility) {
+  var validUnits = Units.slice(0).filter(function(value) {
+    return !(value in compatibility.units) || compatibility.units[value] === true;
+  });
+
+  if (compatibility.customUnits.rpx) {
+    validUnits.push('rpx');
+  }
+
+  return {
+    colorOpacity: compatibility.colors.opacity,
+    colorHexAlpha: compatibility.colors.hexAlpha,
+    isAnimationDirectionKeyword: isKeyword('animation-direction'),
+    isAnimationFillModeKeyword: isKeyword('animation-fill-mode'),
+    isAnimationIterationCountKeyword: isKeyword('animation-iteration-count'),
+    isAnimationNameKeyword: isKeyword('animation-name'),
+    isAnimationPlayStateKeyword: isKeyword('animation-play-state'),
+    isTimingFunction: isTimingFunction(),
+    isBackgroundAttachmentKeyword: isKeyword('background-attachment'),
+    isBackgroundClipKeyword: isKeyword('background-clip'),
+    isBackgroundOriginKeyword: isKeyword('background-origin'),
+    isBackgroundPositionKeyword: isKeyword('background-position'),
+    isBackgroundRepeatKeyword: isKeyword('background-repeat'),
+    isBackgroundSizeKeyword: isKeyword('background-size'),
+    isColor: isColor,
+    isColorFunction: isColorFunction,
+    isDynamicUnit: isDynamicUnit,
+    isFontKeyword: isKeyword('font'),
+    isFontSizeKeyword: isKeyword('font-size'),
+    isFontStretchKeyword: isKeyword('font-stretch'),
+    isFontStyleKeyword: isKeyword('font-style'),
+    isFontVariantKeyword: isKeyword('font-variant'),
+    isFontWeightKeyword: isKeyword('font-weight'),
+    isFunction: isFunction,
+    isGlobal: isKeyword('^'),
+    isHexAlphaColor: isHexAlphaColor,
+    isHslColor: isHslColor,
+    isIdentifier: isIdentifier,
+    isImage: isImage,
+    isKeyword: isKeyword,
+    isLineHeightKeyword: isKeyword('line-height'),
+    isListStylePositionKeyword: isKeyword('list-style-position'),
+    isListStyleTypeKeyword: isKeyword('list-style-type'),
+    isNumber: isNumber,
+    isPrefixed: isPrefixed,
+    isPositiveNumber: isPositiveNumber,
+    isQuotedText: isQuotedText,
+    isRgbColor: isRgbColor,
+    isStyleKeyword: isKeyword('*-style'),
+    isTime: isTime,
+    isUnit: isUnit.bind(null, validUnits),
+    isUrl: isUrl,
+    isVariable: isVariable,
+    isWidth: isKeyword('width'),
+    isZIndex: isZIndex
+  };
+}
+
+module.exports = validator;
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/vendor-prefixes.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/vendor-prefixes.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/vendor-prefixes.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,24 @@
+var VENDOR_PREFIX_PATTERN = /(?:^|\W)(-\w+-)/g;
+
+function unique(value) {
+  var prefixes = [];
+  var match;
+
+  // eslint-disable-next-line no-cond-assign
+  while ((match = VENDOR_PREFIX_PATTERN.exec(value)) !== null) {
+    if (prefixes.indexOf(match[0]) == -1) {
+      prefixes.push(match[0]);
+    }
+  }
+
+  return prefixes;
+}
+
+function same(value1, value2) {
+  return unique(value1).sort().join(',') == unique(value2).sort().join(',');
+}
+
+module.exports = {
+  unique: unique,
+  same: same
+};
Index: imaps-frontend/node_modules/clean-css/lib/optimizer/wrap-for-optimizing.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/optimizer/wrap-for-optimizing.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/optimizer/wrap-for-optimizing.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,192 @@
+var Hack = require('./hack');
+
+var Marker = require('../tokenizer/marker');
+var Token = require('../tokenizer/token');
+
+var Match = {
+  ASTERISK: '*',
+  BACKSLASH: '\\',
+  BANG: '!',
+  BANG_SUFFIX_PATTERN: /!\w+$/,
+  IMPORTANT_TOKEN: '!important',
+  IMPORTANT_TOKEN_PATTERN: new RegExp('!important$', 'i'),
+  IMPORTANT_WORD: 'important',
+  IMPORTANT_WORD_PATTERN: new RegExp('important$', 'i'),
+  SUFFIX_BANG_PATTERN: /!$/,
+  UNDERSCORE: '_',
+  VARIABLE_REFERENCE_PATTERN: /var\(--.+\)$/
+};
+
+function wrapAll(properties, skipProperties) {
+  var wrapped = [];
+  var single;
+  var property;
+  var i;
+
+  for (i = properties.length - 1; i >= 0; i--) {
+    property = properties[i];
+
+    if (property[0] != Token.PROPERTY) {
+      continue;
+    }
+
+    if (skipProperties && skipProperties.indexOf(property[1][1]) > -1) {
+      continue;
+    }
+
+    single = wrapSingle(property);
+    single.all = properties;
+    single.position = i;
+    wrapped.unshift(single);
+  }
+
+  return wrapped;
+}
+
+function someVariableReferences(property) {
+  var i, l;
+  var value;
+
+  // skipping `property` and property name tokens
+  for (i = 2, l = property.length; i < l; i++) {
+    value = property[i];
+
+    if (value[0] != Token.PROPERTY_VALUE) {
+      continue;
+    }
+
+    if (isVariableReference(value[1])) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function isVariableReference(value) {
+  return Match.VARIABLE_REFERENCE_PATTERN.test(value);
+}
+
+function isMultiplex(property) {
+  var value;
+  var i, l;
+
+  for (i = 3, l = property.length; i < l; i++) {
+    value = property[i];
+
+    if (value[0] == Token.PROPERTY_VALUE && (value[1] == Marker.COMMA || value[1] == Marker.FORWARD_SLASH)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function hackFrom(property) {
+  var match = false;
+  var name = property[1][1];
+  var lastValue = property[property.length - 1];
+
+  if (name[0] == Match.UNDERSCORE) {
+    match = [Hack.UNDERSCORE];
+  } else if (name[0] == Match.ASTERISK) {
+    match = [Hack.ASTERISK];
+  } else if (lastValue[1][0] == Match.BANG && !lastValue[1].match(Match.IMPORTANT_WORD_PATTERN)) {
+    match = [Hack.BANG];
+  } else if (lastValue[1].indexOf(Match.BANG) > 0
+    && !lastValue[1].match(Match.IMPORTANT_WORD_PATTERN)
+    && Match.BANG_SUFFIX_PATTERN.test(lastValue[1])) {
+    match = [Hack.BANG];
+  } else if (lastValue[1].indexOf(Match.BACKSLASH) > 0
+    && lastValue[1].indexOf(Match.BACKSLASH) == lastValue[1].length - Match.BACKSLASH.length - 1) {
+    match = [Hack.BACKSLASH, lastValue[1].substring(lastValue[1].indexOf(Match.BACKSLASH) + 1)];
+  } else if (lastValue[1].indexOf(Match.BACKSLASH) === 0 && lastValue[1].length == 2) {
+    match = [Hack.BACKSLASH, lastValue[1].substring(1)];
+  }
+
+  return match;
+}
+
+function isImportant(property) {
+  if (property.length < 3) { return false; }
+
+  var lastValue = property[property.length - 1];
+  if (Match.IMPORTANT_TOKEN_PATTERN.test(lastValue[1])) {
+    return true;
+  } if (Match.IMPORTANT_WORD_PATTERN.test(lastValue[1])
+    && Match.SUFFIX_BANG_PATTERN.test(property[property.length - 2][1])) {
+    return true;
+  }
+
+  return false;
+}
+
+function stripImportant(property) {
+  var lastValue = property[property.length - 1];
+  var oneButLastValue = property[property.length - 2];
+
+  if (Match.IMPORTANT_TOKEN_PATTERN.test(lastValue[1])) {
+    lastValue[1] = lastValue[1].replace(Match.IMPORTANT_TOKEN_PATTERN, '');
+  } else {
+    lastValue[1] = lastValue[1].replace(Match.IMPORTANT_WORD_PATTERN, '');
+    oneButLastValue[1] = oneButLastValue[1].replace(Match.SUFFIX_BANG_PATTERN, '');
+  }
+
+  if (lastValue[1].length === 0) {
+    property.pop();
+  }
+
+  if (oneButLastValue[1].length === 0) {
+    property.pop();
+  }
+}
+
+function stripPrefixHack(property) {
+  property[1][1] = property[1][1].substring(1);
+}
+
+function stripSuffixHack(property, hackFrom) {
+  var lastValue = property[property.length - 1];
+  lastValue[1] = lastValue[1]
+    .substring(0, lastValue[1].indexOf(hackFrom[0] == Hack.BACKSLASH ? Match.BACKSLASH : Match.BANG))
+    .trim();
+
+  if (lastValue[1].length === 0) {
+    property.pop();
+  }
+}
+
+function wrapSingle(property) {
+  var importantProperty = isImportant(property);
+  if (importantProperty) {
+    stripImportant(property);
+  }
+
+  var whichHack = hackFrom(property);
+  if (whichHack[0] == Hack.ASTERISK || whichHack[0] == Hack.UNDERSCORE) {
+    stripPrefixHack(property);
+  } else if (whichHack[0] == Hack.BACKSLASH || whichHack[0] == Hack.BANG) {
+    stripSuffixHack(property, whichHack);
+  }
+
+  return {
+    block: property[2] && property[2][0] == Token.PROPERTY_BLOCK,
+    components: [],
+    dirty: false,
+    dynamic: someVariableReferences(property),
+    hack: whichHack,
+    important: importantProperty,
+    name: property[1][1],
+    multiplex: property.length > 3 ? isMultiplex(property) : false,
+    optimizable: true,
+    position: 0,
+    shorthand: false,
+    unused: false,
+    value: property.slice(2)
+  };
+}
+
+module.exports = {
+  all: wrapAll,
+  single: wrapSingle
+};
Index: imaps-frontend/node_modules/clean-css/lib/options/compatibility.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/compatibility.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/compatibility.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,181 @@
+var DEFAULTS = {
+  '*': {
+    colors: {
+      hexAlpha: false, // 4- and 8-character hex notation
+      opacity: true // rgba / hsla
+    },
+    customUnits: { rpx: false },
+    properties: {
+      backgroundClipMerging: true, // background-clip to shorthand
+      backgroundOriginMerging: true, // background-origin to shorthand
+      backgroundSizeMerging: true, // background-size to shorthand
+      colors: true, // any kind of color transformations, like `#ff00ff` to `#f0f` or `#fff` into `red`
+      ieBangHack: false, // !ie suffix hacks on IE<8
+      ieFilters: false, // whether to preserve `filter` and `-ms-filter` properties
+      iePrefixHack: false, // underscore / asterisk prefix hacks on IE
+      ieSuffixHack: false, // \9 suffix hacks on IE6-9, \0 suffix hack on IE6-11
+      merging: true, // merging properties into one
+      shorterLengthUnits: false, // optimize pixel units into `pt`, `pc` or `in` units
+      spaceAfterClosingBrace: true, // 'url() no-repeat' to 'url()no-repeat'
+      urlQuotes: true, // whether to wrap content of `url()` into quotes or not
+      zeroUnits: true // 0[unit] -> 0
+    },
+    selectors: {
+      adjacentSpace: false, // div+ nav Android stock browser hack
+      ie7Hack: false, // *+html hack
+      mergeablePseudoClasses: [
+        ':active',
+        ':after',
+        ':before',
+        ':empty',
+        ':checked',
+        ':disabled',
+        ':empty',
+        ':enabled',
+        ':first-child',
+        ':first-letter',
+        ':first-line',
+        ':first-of-type',
+        ':focus',
+        ':hover',
+        ':lang',
+        ':last-child',
+        ':last-of-type',
+        ':link',
+        ':not',
+        ':nth-child',
+        ':nth-last-child',
+        ':nth-last-of-type',
+        ':nth-of-type',
+        ':only-child',
+        ':only-of-type',
+        ':root',
+        ':target',
+        ':visited'
+      ], // selectors with these pseudo-classes can be merged as these are universally supported
+      mergeablePseudoElements: [
+        '::after',
+        '::before',
+        '::first-letter',
+        '::first-line'
+      ], // selectors with these pseudo-elements can be merged as these are universally supported
+      mergeLimit: 8191, // number of rules that can be safely merged together
+      multiplePseudoMerging: true
+    },
+    units: {
+      ch: true,
+      in: true,
+      pc: true,
+      pt: true,
+      rem: true,
+      vh: true,
+      vm: true, // vm is vmin on IE9+ see https://developer.mozilla.org/en-US/docs/Web/CSS/length
+      vmax: true,
+      vmin: true,
+      vw: true
+    }
+  }
+};
+
+DEFAULTS.ie11 = merge(DEFAULTS['*'], { properties: { ieSuffixHack: true } });
+
+DEFAULTS.ie10 = merge(DEFAULTS['*'], { properties: { ieSuffixHack: true } });
+
+DEFAULTS.ie9 = merge(DEFAULTS['*'], {
+  properties: {
+    ieFilters: true,
+    ieSuffixHack: true
+  }
+});
+
+DEFAULTS.ie8 = merge(DEFAULTS.ie9, {
+  colors: { opacity: false },
+  properties: {
+    backgroundClipMerging: false,
+    backgroundOriginMerging: false,
+    backgroundSizeMerging: false,
+    iePrefixHack: true,
+    merging: false
+  },
+  selectors: {
+    mergeablePseudoClasses: [
+      ':after',
+      ':before',
+      ':first-child',
+      ':first-letter',
+      ':focus',
+      ':hover',
+      ':visited'
+    ],
+    mergeablePseudoElements: []
+  },
+  units: {
+    ch: false,
+    rem: false,
+    vh: false,
+    vm: false,
+    vmax: false,
+    vmin: false,
+    vw: false
+  }
+});
+
+DEFAULTS.ie7 = merge(DEFAULTS.ie8, {
+  properties: { ieBangHack: true },
+  selectors: {
+    ie7Hack: true,
+    mergeablePseudoClasses: [
+      ':first-child',
+      ':first-letter',
+      ':hover',
+      ':visited'
+    ]
+  }
+});
+
+function compatibilityFrom(source) {
+  return merge(DEFAULTS['*'], calculateSource(source));
+}
+
+function merge(source, target) {
+  for (var key in source) {
+    if (Object.prototype.hasOwnProperty.call(source, key)) {
+      var value = source[key];
+
+      if (Object.prototype.hasOwnProperty.call(target, key) && typeof value === 'object' && !Array.isArray(value)) {
+        target[key] = merge(value, target[key] || {});
+      } else {
+        target[key] = key in target ? target[key] : value;
+      }
+    }
+  }
+
+  return target;
+}
+
+function calculateSource(source) {
+  if (typeof source == 'object') { return source; }
+
+  if (!/[,+-]/.test(source)) { return DEFAULTS[source] || DEFAULTS['*']; }
+
+  var parts = source.split(',');
+  var template = parts[0] in DEFAULTS
+    ? DEFAULTS[parts.shift()]
+    : DEFAULTS['*'];
+
+  source = {};
+
+  parts.forEach(function(part) {
+    var isAdd = part[0] == '+';
+    var key = part.substring(1).split('.');
+    var group = key[0];
+    var option = key[1];
+
+    source[group] = source[group] || {};
+    source[group][option] = isAdd;
+  });
+
+  return merge(template, source);
+}
+
+module.exports = compatibilityFrom;
Index: imaps-frontend/node_modules/clean-css/lib/options/fetch.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/fetch.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/fetch.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var loadRemoteResource = require('../reader/load-remote-resource');
+
+function fetchFrom(callback) {
+  return callback || loadRemoteResource;
+}
+
+module.exports = fetchFrom;
Index: imaps-frontend/node_modules/clean-css/lib/options/format.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/format.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/format.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,241 @@
+var override = require('../utils/override');
+
+function getSystemLineBreak() {
+  var systemLineBreak = '\n';
+  try {
+    var os = require('os');
+    systemLineBreak = os.EOL;
+  } catch (_) {
+    // no op
+  }
+  return systemLineBreak;
+}
+
+var Breaks = {
+  AfterAtRule: 'afterAtRule',
+  AfterBlockBegins: 'afterBlockBegins',
+  AfterBlockEnds: 'afterBlockEnds',
+  AfterComment: 'afterComment',
+  AfterProperty: 'afterProperty',
+  AfterRuleBegins: 'afterRuleBegins',
+  AfterRuleEnds: 'afterRuleEnds',
+  BeforeBlockEnds: 'beforeBlockEnds',
+  BetweenSelectors: 'betweenSelectors'
+};
+
+var BreakWith = {
+  CarriageReturnLineFeed: '\r\n',
+  LineFeed: '\n',
+  System: getSystemLineBreak()
+};
+
+var IndentWith = {
+  Space: ' ',
+  Tab: '\t'
+};
+
+var Spaces = {
+  AroundSelectorRelation: 'aroundSelectorRelation',
+  BeforeBlockBegins: 'beforeBlockBegins',
+  BeforeValue: 'beforeValue'
+};
+
+var DEFAULTS = {
+  breaks: breaks(false),
+  breakWith: BreakWith.System,
+  indentBy: 0,
+  indentWith: IndentWith.Space,
+  spaces: spaces(false),
+  wrapAt: false,
+  semicolonAfterLastProperty: false
+};
+
+var BEAUTIFY_ALIAS = 'beautify';
+var KEEP_BREAKS_ALIAS = 'keep-breaks';
+
+var OPTION_SEPARATOR = ';';
+var OPTION_NAME_VALUE_SEPARATOR = ':';
+var HASH_VALUES_OPTION_SEPARATOR = ',';
+var HASH_VALUES_NAME_VALUE_SEPARATOR = '=';
+
+var FALSE_KEYWORD_1 = 'false';
+var FALSE_KEYWORD_2 = 'off';
+var TRUE_KEYWORD_1 = 'true';
+var TRUE_KEYWORD_2 = 'on';
+
+function breaks(value) {
+  var breakOptions = {};
+
+  breakOptions[Breaks.AfterAtRule] = value;
+  breakOptions[Breaks.AfterBlockBegins] = value;
+  breakOptions[Breaks.AfterBlockEnds] = value;
+  breakOptions[Breaks.AfterComment] = value;
+  breakOptions[Breaks.AfterProperty] = value;
+  breakOptions[Breaks.AfterRuleBegins] = value;
+  breakOptions[Breaks.AfterRuleEnds] = value;
+  breakOptions[Breaks.BeforeBlockEnds] = value;
+  breakOptions[Breaks.BetweenSelectors] = value;
+
+  return breakOptions;
+}
+
+function spaces(value) {
+  var spaceOptions = {};
+
+  spaceOptions[Spaces.AroundSelectorRelation] = value;
+  spaceOptions[Spaces.BeforeBlockBegins] = value;
+  spaceOptions[Spaces.BeforeValue] = value;
+
+  return spaceOptions;
+}
+
+function formatFrom(source) {
+  if (source === undefined || source === false) {
+    return false;
+  }
+
+  if (typeof source == 'object' && 'breakWith' in source) {
+    source = override(source, { breakWith: mapBreakWith(source.breakWith) });
+  }
+
+  if (typeof source == 'object' && 'indentBy' in source) {
+    source = override(source, { indentBy: parseInt(source.indentBy) });
+  }
+
+  if (typeof source == 'object' && 'indentWith' in source) {
+    source = override(source, { indentWith: mapIndentWith(source.indentWith) });
+  }
+
+  if (typeof source == 'object') {
+    return remapBreaks(override(DEFAULTS, source));
+  }
+
+  if (typeof source == 'string' && source == BEAUTIFY_ALIAS) {
+    return remapBreaks(
+      override(DEFAULTS, {
+        breaks: breaks(true),
+        indentBy: 2,
+        spaces: spaces(true)
+      })
+    );
+  }
+
+  if (typeof source == 'string' && source == KEEP_BREAKS_ALIAS) {
+    return remapBreaks(
+      override(DEFAULTS, {
+        breaks: {
+          afterAtRule: true,
+          afterBlockBegins: true,
+          afterBlockEnds: true,
+          afterComment: true,
+          afterRuleEnds: true,
+          beforeBlockEnds: true
+        }
+      })
+    );
+  }
+
+  if (typeof source == 'string') {
+    return remapBreaks(override(DEFAULTS, toHash(source)));
+  }
+
+  return DEFAULTS;
+}
+
+function toHash(string) {
+  return string
+    .split(OPTION_SEPARATOR)
+    .reduce(function(accumulator, directive) {
+      var parts = directive.split(OPTION_NAME_VALUE_SEPARATOR);
+      var name = parts[0];
+      var value = parts[1];
+
+      if (name == 'breaks' || name == 'spaces') {
+        accumulator[name] = hashValuesToHash(value);
+      } else if (name == 'indentBy' || name == 'wrapAt') {
+        accumulator[name] = parseInt(value);
+      } else if (name == 'indentWith') {
+        accumulator[name] = mapIndentWith(value);
+      } else if (name == 'breakWith') {
+        accumulator[name] = mapBreakWith(value);
+      }
+
+      return accumulator;
+    }, {});
+}
+
+function hashValuesToHash(string) {
+  return string
+    .split(HASH_VALUES_OPTION_SEPARATOR)
+    .reduce(function(accumulator, directive) {
+      var parts = directive.split(HASH_VALUES_NAME_VALUE_SEPARATOR);
+      var name = parts[0];
+      var value = parts[1];
+
+      accumulator[name] = normalizeValue(value);
+
+      return accumulator;
+    }, {});
+}
+
+function normalizeValue(value) {
+  switch (value) {
+  case FALSE_KEYWORD_1:
+  case FALSE_KEYWORD_2:
+    return false;
+  case TRUE_KEYWORD_1:
+  case TRUE_KEYWORD_2:
+    return true;
+  default:
+    return value;
+  }
+}
+
+function mapBreakWith(value) {
+  switch (value) {
+  case 'windows':
+  case 'crlf':
+  case BreakWith.CarriageReturnLineFeed:
+    return BreakWith.CarriageReturnLineFeed;
+  case 'unix':
+  case 'lf':
+  case BreakWith.LineFeed:
+    return BreakWith.LineFeed;
+  default:
+    return BreakWith.System;
+  }
+}
+
+function mapIndentWith(value) {
+  switch (value) {
+  case 'space':
+    return IndentWith.Space;
+  case 'tab':
+    return IndentWith.Tab;
+  default:
+    return value;
+  }
+}
+
+function remapBreaks(source) {
+  for (var key in Breaks) {
+    var breakName = Breaks[key];
+    var breakValue = source.breaks[breakName];
+
+    if (breakValue === true) {
+      source.breaks[breakName] = source.breakWith;
+    } else if (breakValue === false) {
+      source.breaks[breakName] = '';
+    } else {
+      source.breaks[breakName] = source.breakWith.repeat(parseInt(breakValue));
+    }
+  }
+
+  return source;
+}
+
+module.exports = {
+  Breaks: Breaks,
+  Spaces: Spaces,
+  formatFrom: formatFrom
+};
Index: imaps-frontend/node_modules/clean-css/lib/options/inline-request.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/inline-request.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/inline-request.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,22 @@
+var url = require('url');
+
+var override = require('../utils/override');
+
+function inlineRequestFrom(option) {
+  return override(
+    /* jshint camelcase: false */
+    proxyOptionsFrom(process.env.HTTP_PROXY || process.env.http_proxy),
+    option || {}
+  );
+}
+
+function proxyOptionsFrom(httpProxy) {
+  return httpProxy
+    ? {
+      hostname: url.parse(httpProxy).hostname,
+      port: parseInt(url.parse(httpProxy).port)
+    }
+    : {};
+}
+
+module.exports = inlineRequestFrom;
Index: imaps-frontend/node_modules/clean-css/lib/options/inline-timeout.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/inline-timeout.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/inline-timeout.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var DEFAULT_TIMEOUT = 5000;
+
+function inlineTimeoutFrom(option) {
+  return option || DEFAULT_TIMEOUT;
+}
+
+module.exports = inlineTimeoutFrom;
Index: imaps-frontend/node_modules/clean-css/lib/options/inline.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/inline.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/inline.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,15 @@
+function inlineOptionsFrom(rules) {
+  if (Array.isArray(rules)) {
+    return rules;
+  }
+
+  if (rules === false) {
+    return ['none'];
+  }
+
+  return undefined === rules
+    ? ['local']
+    : rules.split(',');
+}
+
+module.exports = inlineOptionsFrom;
Index: imaps-frontend/node_modules/clean-css/lib/options/optimization-level.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/optimization-level.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/optimization-level.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,218 @@
+var roundingPrecisionFrom = require('./rounding-precision').roundingPrecisionFrom;
+
+var override = require('../utils/override');
+
+var OptimizationLevel = {
+  Zero: '0',
+  One: '1',
+  Two: '2'
+};
+
+var DEFAULTS = {};
+
+DEFAULTS[OptimizationLevel.Zero] = {};
+DEFAULTS[OptimizationLevel.One] = {
+  cleanupCharsets: true,
+  normalizeUrls: true,
+  optimizeBackground: true,
+  optimizeBorderRadius: true,
+  optimizeFilter: true,
+  optimizeFontWeight: true,
+  optimizeOutline: true,
+  removeEmpty: true,
+  removeNegativePaddings: true,
+  removeQuotes: true,
+  removeWhitespace: true,
+  replaceMultipleZeros: true,
+  replaceTimeUnits: true,
+  replaceZeroUnits: true,
+  roundingPrecision: roundingPrecisionFrom(undefined),
+  selectorsSortingMethod: 'standard',
+  specialComments: 'all',
+  tidyAtRules: true,
+  tidyBlockScopes: true,
+  tidySelectors: true,
+  variableValueOptimizers: []
+};
+DEFAULTS[OptimizationLevel.Two] = {
+  mergeAdjacentRules: true,
+  mergeIntoShorthands: true,
+  mergeMedia: true,
+  mergeNonAdjacentRules: true,
+  mergeSemantically: false,
+  overrideProperties: true,
+  removeEmpty: true,
+  reduceNonAdjacentRules: true,
+  removeDuplicateFontRules: true,
+  removeDuplicateMediaBlocks: true,
+  removeDuplicateRules: true,
+  removeUnusedAtRules: false,
+  restructureRules: false,
+  skipProperties: []
+};
+
+var ALL_KEYWORD_1 = '*';
+var ALL_KEYWORD_2 = 'all';
+var FALSE_KEYWORD_1 = 'false';
+var FALSE_KEYWORD_2 = 'off';
+var TRUE_KEYWORD_1 = 'true';
+var TRUE_KEYWORD_2 = 'on';
+
+var LIST_VALUE_SEPARATOR = ',';
+var OPTION_SEPARATOR = ';';
+var OPTION_VALUE_SEPARATOR = ':';
+
+function optimizationLevelFrom(source) {
+  var level = override(DEFAULTS, {});
+  var Zero = OptimizationLevel.Zero;
+  var One = OptimizationLevel.One;
+  var Two = OptimizationLevel.Two;
+
+  if (undefined === source) {
+    delete level[Two];
+    return level;
+  }
+
+  if (typeof source == 'string') {
+    source = parseInt(source);
+  }
+
+  if (typeof source == 'number' && source === parseInt(Two)) {
+    return level;
+  }
+
+  if (typeof source == 'number' && source === parseInt(One)) {
+    delete level[Two];
+    return level;
+  }
+
+  if (typeof source == 'number' && source === parseInt(Zero)) {
+    delete level[Two];
+    delete level[One];
+    return level;
+  }
+
+  if (typeof source == 'object') {
+    source = covertValuesToHashes(source);
+  }
+
+  if (One in source && 'roundingPrecision' in source[One]) {
+    source[One].roundingPrecision = roundingPrecisionFrom(source[One].roundingPrecision);
+  }
+
+  if (Two in source && 'skipProperties' in source[Two] && typeof (source[Two].skipProperties) == 'string') {
+    source[Two].skipProperties = source[Two].skipProperties.split(LIST_VALUE_SEPARATOR);
+  }
+
+  if (Zero in source || One in source || Two in source) {
+    level[Zero] = override(level[Zero], source[Zero]);
+  }
+
+  if (One in source && ALL_KEYWORD_1 in source[One]) {
+    level[One] = override(level[One], defaults(One, normalizeValue(source[One][ALL_KEYWORD_1])));
+    delete source[One][ALL_KEYWORD_1];
+  }
+
+  if (One in source && ALL_KEYWORD_2 in source[One]) {
+    level[One] = override(level[One], defaults(One, normalizeValue(source[One][ALL_KEYWORD_2])));
+    delete source[One][ALL_KEYWORD_2];
+  }
+
+  if (One in source || Two in source) {
+    level[One] = override(level[One], source[One]);
+  } else {
+    delete level[One];
+  }
+
+  if (Two in source && ALL_KEYWORD_1 in source[Two]) {
+    level[Two] = override(level[Two], defaults(Two, normalizeValue(source[Two][ALL_KEYWORD_1])));
+    delete source[Two][ALL_KEYWORD_1];
+  }
+
+  if (Two in source && ALL_KEYWORD_2 in source[Two]) {
+    level[Two] = override(level[Two], defaults(Two, normalizeValue(source[Two][ALL_KEYWORD_2])));
+    delete source[Two][ALL_KEYWORD_2];
+  }
+
+  if (Two in source) {
+    level[Two] = override(level[Two], source[Two]);
+  } else {
+    delete level[Two];
+  }
+
+  return level;
+}
+
+function defaults(level, value) {
+  var options = override(DEFAULTS[level], {});
+  var key;
+
+  for (key in options) {
+    if (typeof options[key] == 'boolean') {
+      options[key] = value;
+    }
+  }
+
+  return options;
+}
+
+function normalizeValue(value) {
+  switch (value) {
+  case FALSE_KEYWORD_1:
+  case FALSE_KEYWORD_2:
+    return false;
+  case TRUE_KEYWORD_1:
+  case TRUE_KEYWORD_2:
+    return true;
+  default:
+    return value;
+  }
+}
+
+function covertValuesToHashes(source) {
+  var clonedSource = override(source, {});
+  var level;
+  var i;
+
+  for (i = 0; i <= 2; i++) {
+    level = '' + i;
+
+    if (level in clonedSource && (clonedSource[level] === undefined || clonedSource[level] === false)) {
+      delete clonedSource[level];
+    }
+
+    if (level in clonedSource && clonedSource[level] === true) {
+      clonedSource[level] = {};
+    }
+
+    if (level in clonedSource && typeof clonedSource[level] == 'string') {
+      clonedSource[level] = covertToHash(clonedSource[level], level);
+    }
+  }
+
+  return clonedSource;
+}
+
+function covertToHash(asString, level) {
+  return asString
+    .split(OPTION_SEPARATOR)
+    .reduce(function(accumulator, directive) {
+      var parts = directive.split(OPTION_VALUE_SEPARATOR);
+      var name = parts[0];
+      var value = parts[1];
+      var normalizedValue = normalizeValue(value);
+
+      if (ALL_KEYWORD_1 == name || ALL_KEYWORD_2 == name) {
+        accumulator = override(accumulator, defaults(level, normalizedValue));
+      } else {
+        accumulator[name] = normalizedValue;
+      }
+
+      return accumulator;
+    }, {});
+}
+
+module.exports = {
+  OptimizationLevel: OptimizationLevel,
+  optimizationLevelFrom: optimizationLevelFrom
+};
Index: imaps-frontend/node_modules/clean-css/lib/options/plugins.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/plugins.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/plugins.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,25 @@
+function pluginsFrom(plugins) {
+  var flatPlugins = {
+    level1Value: [],
+    level1Property: [],
+    level2Block: []
+  };
+
+  plugins = plugins || [];
+
+  flatPlugins.level1Value = plugins
+    .map(function(plugin) { return plugin.level1 && plugin.level1.value; })
+    .filter(function(plugin) { return plugin != null; });
+
+  flatPlugins.level1Property = plugins
+    .map(function(plugin) { return plugin.level1 && plugin.level1.property; })
+    .filter(function(plugin) { return plugin != null; });
+
+  flatPlugins.level2Block = plugins
+    .map(function(plugin) { return plugin.level2 && plugin.level2.block; })
+    .filter(function(plugin) { return plugin != null; });
+
+  return flatPlugins;
+}
+
+module.exports = pluginsFrom;
Index: imaps-frontend/node_modules/clean-css/lib/options/rebase-to.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/rebase-to.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/rebase-to.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var path = require('path');
+
+function rebaseToFrom(option) {
+  return option ? path.resolve(option) : process.cwd();
+}
+
+module.exports = rebaseToFrom;
Index: imaps-frontend/node_modules/clean-css/lib/options/rebase.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/rebase.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/rebase.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,10 @@
+function rebaseFrom(rebaseOption, rebaseToOption) {
+  if (undefined !== rebaseToOption) {
+    return true;
+  } if (undefined === rebaseOption) {
+    return false;
+  }
+  return !!rebaseOption;
+}
+
+module.exports = rebaseFrom;
Index: imaps-frontend/node_modules/clean-css/lib/options/rounding-precision.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/options/rounding-precision.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/options/rounding-precision.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,88 @@
+var override = require('../utils/override');
+
+var INTEGER_PATTERN = /^\d+$/;
+
+var ALL_UNITS = ['*', 'all'];
+var DEFAULT_PRECISION = 'off'; // all precision changes are disabled
+var DIRECTIVES_SEPARATOR = ','; // e.g. *=5,px=3
+var DIRECTIVE_VALUE_SEPARATOR = '='; // e.g. *=5
+
+function roundingPrecisionFrom(source) {
+  return override(defaults(DEFAULT_PRECISION), buildPrecisionFrom(source));
+}
+
+function defaults(value) {
+  return {
+    ch: value,
+    cm: value,
+    em: value,
+    ex: value,
+    in: value,
+    mm: value,
+    pc: value,
+    pt: value,
+    px: value,
+    q: value,
+    rem: value,
+    vh: value,
+    vmax: value,
+    vmin: value,
+    vw: value,
+    '%': value
+  };
+}
+
+function buildPrecisionFrom(source) {
+  if (source === null || source === undefined) {
+    return {};
+  }
+
+  if (typeof source == 'boolean') {
+    return {};
+  }
+
+  if (typeof source == 'number' && source == -1) {
+    return defaults(DEFAULT_PRECISION);
+  }
+
+  if (typeof source == 'number') {
+    return defaults(source);
+  }
+
+  if (typeof source == 'string' && INTEGER_PATTERN.test(source)) {
+    return defaults(parseInt(source));
+  }
+
+  if (typeof source == 'string' && source == DEFAULT_PRECISION) {
+    return defaults(DEFAULT_PRECISION);
+  }
+
+  if (typeof source == 'object') {
+    return source;
+  }
+
+  return source
+    .split(DIRECTIVES_SEPARATOR)
+    .reduce(function(accumulator, directive) {
+      var directiveParts = directive.split(DIRECTIVE_VALUE_SEPARATOR);
+      var name = directiveParts[0];
+      var value = parseInt(directiveParts[1]);
+
+      if (Number.isNaN(value) || value == -1) {
+        value = DEFAULT_PRECISION;
+      }
+
+      if (ALL_UNITS.indexOf(name) > -1) {
+        accumulator = override(accumulator, defaults(value));
+      } else {
+        accumulator[name] = value;
+      }
+
+      return accumulator;
+    }, {});
+}
+
+module.exports = {
+  DEFAULT: DEFAULT_PRECISION,
+  roundingPrecisionFrom: roundingPrecisionFrom
+};
Index: imaps-frontend/node_modules/clean-css/lib/reader/apply-source-maps.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/apply-source-maps.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/apply-source-maps.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,246 @@
+var fs = require('fs');
+var path = require('path');
+
+var isAllowedResource = require('./is-allowed-resource');
+var matchDataUri = require('./match-data-uri');
+var rebaseLocalMap = require('./rebase-local-map');
+var rebaseRemoteMap = require('./rebase-remote-map');
+
+var Token = require('../tokenizer/token');
+var hasProtocol = require('../utils/has-protocol');
+var isDataUriResource = require('../utils/is-data-uri-resource');
+var isRemoteResource = require('../utils/is-remote-resource');
+
+var MAP_MARKER_PATTERN = /^\/\*# sourceMappingURL=(\S+) \*\/$/;
+
+function applySourceMaps(tokens, context, callback) {
+  var applyContext = {
+    callback: callback,
+    fetch: context.options.fetch,
+    index: 0,
+    inline: context.options.inline,
+    inlineRequest: context.options.inlineRequest,
+    inlineTimeout: context.options.inlineTimeout,
+    inputSourceMapTracker: context.inputSourceMapTracker,
+    localOnly: context.localOnly,
+    processedTokens: [],
+    rebaseTo: context.options.rebaseTo,
+    sourceTokens: tokens,
+    warnings: context.warnings
+  };
+
+  return context.options.sourceMap && tokens.length > 0
+    ? doApplySourceMaps(applyContext)
+    : callback(tokens);
+}
+
+function doApplySourceMaps(applyContext) {
+  var singleSourceTokens = [];
+  var lastSource = findTokenSource(applyContext.sourceTokens[0]);
+  var source;
+  var token;
+  var l;
+
+  for (l = applyContext.sourceTokens.length; applyContext.index < l; applyContext.index++) {
+    token = applyContext.sourceTokens[applyContext.index];
+    source = findTokenSource(token);
+
+    if (source != lastSource) {
+      singleSourceTokens = [];
+      lastSource = source;
+    }
+
+    singleSourceTokens.push(token);
+    applyContext.processedTokens.push(token);
+
+    if (token[0] == Token.COMMENT && MAP_MARKER_PATTERN.test(token[1])) {
+      return fetchAndApplySourceMap(token[1], source, singleSourceTokens, applyContext);
+    }
+  }
+
+  return applyContext.callback(applyContext.processedTokens);
+}
+
+function findTokenSource(token) {
+  var scope;
+  var metadata;
+
+  if (token[0] == Token.AT_RULE || token[0] == Token.COMMENT || token[0] == Token.RAW) {
+    metadata = token[2][0];
+  } else {
+    scope = token[1][0];
+    metadata = scope[2][0];
+  }
+
+  return metadata[2];
+}
+
+function fetchAndApplySourceMap(sourceMapComment, source, singleSourceTokens, applyContext) {
+  return extractInputSourceMapFrom(sourceMapComment, applyContext, function(inputSourceMap) {
+    if (inputSourceMap) {
+      applyContext.inputSourceMapTracker.track(source, inputSourceMap);
+      applySourceMapRecursively(singleSourceTokens, applyContext.inputSourceMapTracker);
+    }
+
+    applyContext.index++;
+    return doApplySourceMaps(applyContext);
+  });
+}
+
+function extractInputSourceMapFrom(sourceMapComment, applyContext, whenSourceMapReady) {
+  var uri = MAP_MARKER_PATTERN.exec(sourceMapComment)[1];
+  var absoluteUri;
+  var sourceMap;
+  var rebasedMap;
+
+  if (isDataUriResource(uri)) {
+    sourceMap = extractInputSourceMapFromDataUri(uri);
+    return whenSourceMapReady(sourceMap);
+  } if (isRemoteResource(uri)) {
+    return loadInputSourceMapFromRemoteUri(uri, applyContext, function(sourceMap) {
+      var parsedMap;
+
+      if (sourceMap) {
+        parsedMap = JSON.parse(sourceMap);
+        rebasedMap = rebaseRemoteMap(parsedMap, uri);
+        whenSourceMapReady(rebasedMap);
+      } else {
+        whenSourceMapReady(null);
+      }
+    });
+  }
+  // at this point `uri` is already rebased, see lib/reader/rebase.js#rebaseSourceMapComment
+  // it is rebased to be consistent with rebasing other URIs
+  // however here we need to resolve it back to read it from disk
+  absoluteUri = path.resolve(applyContext.rebaseTo, uri);
+  sourceMap = loadInputSourceMapFromLocalUri(absoluteUri, applyContext);
+
+  if (sourceMap) {
+    rebasedMap = rebaseLocalMap(sourceMap, absoluteUri, applyContext.rebaseTo);
+    return whenSourceMapReady(rebasedMap);
+  }
+  return whenSourceMapReady(null);
+}
+
+function extractInputSourceMapFromDataUri(uri) {
+  var dataUriMatch = matchDataUri(uri);
+  var charset = dataUriMatch[2] ? dataUriMatch[2].split(/[=;]/)[2] : 'us-ascii';
+  var encoding = dataUriMatch[3] ? dataUriMatch[3].split(';')[1] : 'utf8';
+  var data = encoding == 'utf8' ? global.unescape(dataUriMatch[4]) : dataUriMatch[4];
+
+  var buffer = Buffer.from(data, encoding);
+  buffer.charset = charset;
+
+  return JSON.parse(buffer.toString());
+}
+
+function loadInputSourceMapFromRemoteUri(uri, applyContext, whenLoaded) {
+  var isAllowed = isAllowedResource(uri, true, applyContext.inline);
+  var isRuntimeResource = !hasProtocol(uri);
+
+  if (applyContext.localOnly) {
+    applyContext.warnings.push('Cannot fetch remote resource from "' + uri + '" as no callback given.');
+    return whenLoaded(null);
+  } if (isRuntimeResource) {
+    applyContext.warnings.push('Cannot fetch "' + uri + '" as no protocol given.');
+    return whenLoaded(null);
+  } if (!isAllowed) {
+    applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
+    return whenLoaded(null);
+  }
+
+  applyContext.fetch(uri, applyContext.inlineRequest, applyContext.inlineTimeout, function(error, body) {
+    if (error) {
+      applyContext.warnings.push('Missing source map at "' + uri + '" - ' + error);
+      return whenLoaded(null);
+    }
+
+    whenLoaded(body);
+  });
+}
+
+function loadInputSourceMapFromLocalUri(uri, applyContext) {
+  var isAllowed = isAllowedResource(uri, false, applyContext.inline);
+  var sourceMap;
+
+  if (!fs.existsSync(uri) || !fs.statSync(uri).isFile()) {
+    applyContext.warnings.push('Ignoring local source map at "' + uri + '" as resource is missing.');
+    return null;
+  } if (!isAllowed) {
+    applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
+    return null;
+  } if (!fs.statSync(uri).size) {
+    applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is empty.');
+    return null;
+  }
+
+  sourceMap = fs.readFileSync(uri, 'utf-8');
+  return JSON.parse(sourceMap);
+}
+
+function applySourceMapRecursively(tokens, inputSourceMapTracker) {
+  var token;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+
+    switch (token[0]) {
+    case Token.AT_RULE:
+      applySourceMapTo(token, inputSourceMapTracker);
+      break;
+    case Token.AT_RULE_BLOCK:
+      applySourceMapRecursively(token[1], inputSourceMapTracker);
+      applySourceMapRecursively(token[2], inputSourceMapTracker);
+      break;
+    case Token.AT_RULE_BLOCK_SCOPE:
+      applySourceMapTo(token, inputSourceMapTracker);
+      break;
+    case Token.NESTED_BLOCK:
+      applySourceMapRecursively(token[1], inputSourceMapTracker);
+      applySourceMapRecursively(token[2], inputSourceMapTracker);
+      break;
+    case Token.NESTED_BLOCK_SCOPE:
+      applySourceMapTo(token, inputSourceMapTracker);
+      break;
+    case Token.COMMENT:
+      applySourceMapTo(token, inputSourceMapTracker);
+      break;
+    case Token.PROPERTY:
+      applySourceMapRecursively(token, inputSourceMapTracker);
+      break;
+    case Token.PROPERTY_BLOCK:
+      applySourceMapRecursively(token[1], inputSourceMapTracker);
+      break;
+    case Token.PROPERTY_NAME:
+      applySourceMapTo(token, inputSourceMapTracker);
+      break;
+    case Token.PROPERTY_VALUE:
+      applySourceMapTo(token, inputSourceMapTracker);
+      break;
+    case Token.RULE:
+      applySourceMapRecursively(token[1], inputSourceMapTracker);
+      applySourceMapRecursively(token[2], inputSourceMapTracker);
+      break;
+    case Token.RULE_SCOPE:
+      applySourceMapTo(token, inputSourceMapTracker);
+    }
+  }
+
+  return tokens;
+}
+
+function applySourceMapTo(token, inputSourceMapTracker) {
+  var value = token[1];
+  var metadata = token[2];
+  var newMetadata = [];
+  var i, l;
+
+  for (i = 0, l = metadata.length; i < l; i++) {
+    newMetadata.push(inputSourceMapTracker.originalPositionFor(metadata[i], value.length));
+  }
+
+  token[2] = newMetadata;
+}
+
+module.exports = applySourceMaps;
Index: imaps-frontend/node_modules/clean-css/lib/reader/extract-import-url-and-media.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/extract-import-url-and-media.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/extract-import-url-and-media.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,35 @@
+var split = require('../utils/split');
+
+var BRACE_PREFIX = /^\(/;
+var BRACE_SUFFIX = /\)$/;
+var IMPORT_PREFIX_PATTERN = /^@import/i;
+var QUOTE_PREFIX_PATTERN = /['"]\s{0,31}/;
+var QUOTE_SUFFIX_PATTERN = /\s{0,31}['"]/;
+var URL_PREFIX_PATTERN = /^url\(\s{0,31}/i;
+var URL_SUFFIX_PATTERN = /\s{0,31}\)/i;
+
+function extractImportUrlAndMedia(atRuleValue) {
+  var uri;
+  var mediaQuery;
+  var normalized;
+  var parts;
+
+  normalized = atRuleValue
+    .replace(IMPORT_PREFIX_PATTERN, '')
+    .trim()
+    .replace(URL_PREFIX_PATTERN, '(')
+    .replace(URL_SUFFIX_PATTERN, ') ')
+    .replace(QUOTE_PREFIX_PATTERN, '')
+    .replace(QUOTE_SUFFIX_PATTERN, '');
+
+  parts = split(normalized, ' ');
+
+  uri = parts[0]
+    .replace(BRACE_PREFIX, '')
+    .replace(BRACE_SUFFIX, '');
+  mediaQuery = parts.slice(1).join(' ');
+
+  return [uri, mediaQuery];
+}
+
+module.exports = extractImportUrlAndMedia;
Index: imaps-frontend/node_modules/clean-css/lib/reader/input-source-map-tracker.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/input-source-map-tracker.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/input-source-map-tracker.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,58 @@
+var SourceMapConsumer = require('source-map').SourceMapConsumer;
+
+function inputSourceMapTracker() {
+  var maps = {};
+
+  return {
+    all: all.bind(null, maps),
+    isTracking: isTracking.bind(null, maps),
+    originalPositionFor: originalPositionFor.bind(null, maps),
+    track: track.bind(null, maps)
+  };
+}
+
+function all(maps) {
+  return maps;
+}
+
+function isTracking(maps, source) {
+  return source in maps;
+}
+
+function originalPositionFor(maps, metadata, range, selectorFallbacks) {
+  var line = metadata[0];
+  var column = metadata[1];
+  var source = metadata[2];
+  var position = {
+    line: line,
+    column: column + range
+  };
+  var originalPosition;
+
+  while (!originalPosition && position.column > column) {
+    position.column--;
+    originalPosition = maps[source].originalPositionFor(position);
+  }
+
+  if (!originalPosition || originalPosition.column < 0) {
+    return metadata;
+  }
+
+  if (originalPosition.line === null && line > 1 && selectorFallbacks > 0) {
+    return originalPositionFor(maps, [line - 1, column, source], range, selectorFallbacks - 1);
+  }
+
+  return originalPosition.line !== null
+    ? toMetadata(originalPosition)
+    : metadata;
+}
+
+function toMetadata(asHash) {
+  return [asHash.line, asHash.column, asHash.source];
+}
+
+function track(maps, source, data) {
+  maps[source] = new SourceMapConsumer(data);
+}
+
+module.exports = inputSourceMapTracker;
Index: imaps-frontend/node_modules/clean-css/lib/reader/is-allowed-resource.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/is-allowed-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/is-allowed-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,77 @@
+var path = require('path');
+var url = require('url');
+
+var isRemoteResource = require('../utils/is-remote-resource');
+var hasProtocol = require('../utils/has-protocol');
+
+var HTTP_PROTOCOL = 'http:';
+
+function isAllowedResource(uri, isRemote, rules) {
+  var match;
+  var absoluteUri;
+  var allowed = !isRemote;
+  var rule;
+  var isNegated;
+  var normalizedRule;
+  var i;
+
+  if (rules.length === 0) {
+    return false;
+  }
+
+  if (isRemote && !hasProtocol(uri)) {
+    uri = HTTP_PROTOCOL + uri;
+  }
+
+  match = isRemote
+    ? url.parse(uri).host
+    : uri;
+
+  absoluteUri = isRemote
+    ? uri
+    : path.resolve(uri);
+
+  for (i = 0; i < rules.length; i++) {
+    rule = rules[i];
+    isNegated = rule[0] == '!';
+    normalizedRule = rule.substring(1);
+
+    if (isNegated && isRemote && isRemoteRule(normalizedRule)) {
+      allowed = allowed && !isAllowedResource(uri, true, [normalizedRule]);
+    } else if (isNegated && !isRemote && !isRemoteRule(normalizedRule)) {
+      allowed = allowed && !isAllowedResource(uri, false, [normalizedRule]);
+    } else if (isNegated) {
+      allowed = allowed && true;
+    } else if (rule == 'all') {
+      allowed = true;
+    } else if (isRemote && rule == 'local') {
+      allowed = allowed || false;
+    } else if (isRemote && rule == 'remote') {
+      allowed = true;
+    } else if (!isRemote && rule == 'remote') {
+      allowed = false;
+    } else if (!isRemote && rule == 'local') {
+      allowed = true;
+    } else if (rule === match) {
+      allowed = true;
+    } else if (rule === uri) {
+      allowed = true;
+    } else if (isRemote && absoluteUri.indexOf(rule) === 0) {
+      allowed = true;
+    } else if (!isRemote && absoluteUri.indexOf(path.resolve(rule)) === 0) {
+      allowed = true;
+    } else if (isRemote != isRemoteRule(normalizedRule)) {
+      allowed = allowed && true;
+    } else {
+      allowed = false;
+    }
+  }
+
+  return allowed;
+}
+
+function isRemoteRule(rule) {
+  return isRemoteResource(rule) || url.parse(HTTP_PROTOCOL + '//' + rule).host == rule;
+}
+
+module.exports = isAllowedResource;
Index: imaps-frontend/node_modules/clean-css/lib/reader/load-original-sources.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/load-original-sources.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/load-original-sources.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,129 @@
+var fs = require('fs');
+var path = require('path');
+
+var isAllowedResource = require('./is-allowed-resource');
+
+var hasProtocol = require('../utils/has-protocol');
+var isRemoteResource = require('../utils/is-remote-resource');
+
+function loadOriginalSources(context, callback) {
+  var loadContext = {
+    callback: callback,
+    fetch: context.options.fetch,
+    index: 0,
+    inline: context.options.inline,
+    inlineRequest: context.options.inlineRequest,
+    inlineTimeout: context.options.inlineTimeout,
+    localOnly: context.localOnly,
+    rebaseTo: context.options.rebaseTo,
+    sourcesContent: context.sourcesContent,
+    uriToSource: uriToSourceMapping(context.inputSourceMapTracker.all()),
+    warnings: context.warnings
+  };
+
+  return context.options.sourceMap && context.options.sourceMapInlineSources
+    ? doLoadOriginalSources(loadContext)
+    : callback();
+}
+
+function uriToSourceMapping(allSourceMapConsumers) {
+  var mapping = {};
+  var consumer;
+  var uri;
+  var source;
+  var i, l;
+
+  for (source in allSourceMapConsumers) {
+    consumer = allSourceMapConsumers[source];
+
+    for (i = 0, l = consumer.sources.length; i < l; i++) {
+      uri = consumer.sources[i];
+      source = consumer.sourceContentFor(uri, true);
+
+      mapping[uri] = source;
+    }
+  }
+
+  return mapping;
+}
+
+function doLoadOriginalSources(loadContext) {
+  var uris = Object.keys(loadContext.uriToSource);
+  var uri;
+  var source;
+  var total;
+
+  for (total = uris.length; loadContext.index < total; loadContext.index++) {
+    uri = uris[loadContext.index];
+    source = loadContext.uriToSource[uri];
+
+    if (source) {
+      loadContext.sourcesContent[uri] = source;
+    } else {
+      return loadOriginalSource(uri, loadContext);
+    }
+  }
+
+  return loadContext.callback();
+}
+
+function loadOriginalSource(uri, loadContext) {
+  var content;
+
+  if (isRemoteResource(uri)) {
+    return loadOriginalSourceFromRemoteUri(uri, loadContext, function(content) {
+      loadContext.index++;
+      loadContext.sourcesContent[uri] = content;
+      return doLoadOriginalSources(loadContext);
+    });
+  }
+  content = loadOriginalSourceFromLocalUri(uri, loadContext);
+  loadContext.index++;
+  loadContext.sourcesContent[uri] = content;
+  return doLoadOriginalSources(loadContext);
+}
+
+function loadOriginalSourceFromRemoteUri(uri, loadContext, whenLoaded) {
+  var isAllowed = isAllowedResource(uri, true, loadContext.inline);
+  var isRuntimeResource = !hasProtocol(uri);
+
+  if (loadContext.localOnly) {
+    loadContext.warnings.push('Cannot fetch remote resource from "' + uri + '" as no callback given.');
+    return whenLoaded(null);
+  } if (isRuntimeResource) {
+    loadContext.warnings.push('Cannot fetch "' + uri + '" as no protocol given.');
+    return whenLoaded(null);
+  } if (!isAllowed) {
+    loadContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
+    return whenLoaded(null);
+  }
+
+  loadContext.fetch(uri, loadContext.inlineRequest, loadContext.inlineTimeout, function(error, content) {
+    if (error) {
+      loadContext.warnings.push('Missing original source at "' + uri + '" - ' + error);
+    }
+
+    whenLoaded(content);
+  });
+}
+
+function loadOriginalSourceFromLocalUri(relativeUri, loadContext) {
+  var isAllowed = isAllowedResource(relativeUri, false, loadContext.inline);
+  var absoluteUri = path.resolve(loadContext.rebaseTo, relativeUri);
+
+  if (!fs.existsSync(absoluteUri) || !fs.statSync(absoluteUri).isFile()) {
+    loadContext.warnings.push('Ignoring local source map at "' + absoluteUri + '" as resource is missing.');
+    return null;
+  } if (!isAllowed) {
+    loadContext.warnings.push('Cannot fetch "' + absoluteUri + '" as resource is not allowed.');
+    return null;
+  }
+
+  var result = fs.readFileSync(absoluteUri, 'utf8');
+  if (result.charCodeAt(0) === 65279) {
+    result = result.substring(1);
+  }
+  return result;
+}
+
+module.exports = loadOriginalSources;
Index: imaps-frontend/node_modules/clean-css/lib/reader/load-remote-resource.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/load-remote-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/load-remote-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,74 @@
+var http = require('http');
+var https = require('https');
+var url = require('url');
+
+var isHttpResource = require('../utils/is-http-resource');
+var isHttpsResource = require('../utils/is-https-resource');
+var override = require('../utils/override');
+
+var HTTP_PROTOCOL = 'http:';
+
+function loadRemoteResource(uri, inlineRequest, inlineTimeout, callback) {
+  var proxyProtocol = inlineRequest.protocol || inlineRequest.hostname;
+  var errorHandled = false;
+  var requestOptions;
+  var fetch;
+
+  requestOptions = override(
+    url.parse(uri),
+    inlineRequest || {}
+  );
+
+  if (inlineRequest.hostname !== undefined) {
+    // overwrite as we always expect a http proxy currently
+    requestOptions.protocol = inlineRequest.protocol || HTTP_PROTOCOL;
+    requestOptions.path = requestOptions.href;
+  }
+
+  fetch = (proxyProtocol && !isHttpsResource(proxyProtocol)) || isHttpResource(uri)
+    ? http.get
+    : https.get;
+
+  fetch(requestOptions, function(res) {
+    var chunks = [];
+    var movedUri;
+
+    if (errorHandled) {
+      return;
+    }
+
+    if (res.statusCode < 200 || res.statusCode > 399) {
+      return callback(res.statusCode, null);
+    } if (res.statusCode > 299) {
+      movedUri = url.resolve(uri, res.headers.location);
+      return loadRemoteResource(movedUri, inlineRequest, inlineTimeout, callback);
+    }
+
+    res.on('data', function(chunk) {
+      chunks.push(chunk.toString());
+    });
+    res.on('end', function() {
+      var body = chunks.join('');
+      callback(null, body);
+    });
+  })
+    .on('error', function(res) {
+      if (errorHandled) {
+        return;
+      }
+
+      errorHandled = true;
+      callback(res.message, null);
+    })
+    .on('timeout', function() {
+      if (errorHandled) {
+        return;
+      }
+
+      errorHandled = true;
+      callback('timeout', null);
+    })
+    .setTimeout(inlineTimeout);
+}
+
+module.exports = loadRemoteResource;
Index: imaps-frontend/node_modules/clean-css/lib/reader/match-data-uri.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/match-data-uri.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/match-data-uri.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var DATA_URI_PATTERN = /^data:(\S*?)?(;charset=(?:(?!;charset=)[^;])+)?(;[^,]+?)?,(.+)/;
+
+function matchDataUri(uri) {
+  return DATA_URI_PATTERN.exec(uri);
+}
+
+module.exports = matchDataUri;
Index: imaps-frontend/node_modules/clean-css/lib/reader/normalize-path.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/normalize-path.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/normalize-path.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,8 @@
+var UNIX_SEPARATOR = '/';
+var WINDOWS_SEPARATOR_PATTERN = /\\/g;
+
+function normalizePath(path) {
+  return path.replace(WINDOWS_SEPARATOR_PATTERN, UNIX_SEPARATOR);
+}
+
+module.exports = normalizePath;
Index: imaps-frontend/node_modules/clean-css/lib/reader/read-sources.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/read-sources.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/read-sources.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,344 @@
+var fs = require('fs');
+var path = require('path');
+
+var applySourceMaps = require('./apply-source-maps');
+var extractImportUrlAndMedia = require('./extract-import-url-and-media');
+var isAllowedResource = require('./is-allowed-resource');
+var loadOriginalSources = require('./load-original-sources');
+var normalizePath = require('./normalize-path');
+var rebase = require('./rebase');
+var rebaseLocalMap = require('./rebase-local-map');
+var rebaseRemoteMap = require('./rebase-remote-map');
+var restoreImport = require('./restore-import');
+
+var tokenize = require('../tokenizer/tokenize');
+var Token = require('../tokenizer/token');
+var Marker = require('../tokenizer/marker');
+var hasProtocol = require('../utils/has-protocol');
+var isImport = require('../utils/is-import');
+var isRemoteResource = require('../utils/is-remote-resource');
+
+var UNKNOWN_URI = 'uri:unknown';
+var FILE_RESOURCE_PROTOCOL = 'file://';
+
+function readSources(input, context, callback) {
+  return doReadSources(input, context, function(tokens) {
+    return applySourceMaps(tokens, context, function() {
+      return loadOriginalSources(context, function() { return callback(tokens); });
+    });
+  });
+}
+
+function doReadSources(input, context, callback) {
+  if (typeof input == 'string') {
+    return fromString(input, context, callback);
+  } if (Buffer.isBuffer(input)) {
+    return fromString(input.toString(), context, callback);
+  } if (Array.isArray(input)) {
+    return fromArray(input, context, callback);
+  } if (typeof input == 'object') {
+    return fromHash(input, context, callback);
+  }
+}
+
+function fromString(input, context, callback) {
+  context.source = undefined;
+  context.sourcesContent[undefined] = input;
+  context.stats.originalSize += input.length;
+
+  return fromStyles(input, context, { inline: context.options.inline }, callback);
+}
+
+function fromArray(input, context, callback) {
+  var inputAsImports = input.reduce(function(accumulator, uriOrHash) {
+    if (typeof uriOrHash === 'string') {
+      return addStringSource(uriOrHash, accumulator);
+    }
+    return addHashSource(uriOrHash, context, accumulator);
+  }, []);
+
+  return fromStyles(inputAsImports.join(''), context, { inline: ['all'] }, callback);
+}
+
+function fromHash(input, context, callback) {
+  var inputAsImports = addHashSource(input, context, []);
+  return fromStyles(inputAsImports.join(''), context, { inline: ['all'] }, callback);
+}
+
+function addStringSource(input, imports) {
+  imports.push(restoreAsImport(normalizeUri(input)));
+  return imports;
+}
+
+function addHashSource(input, context, imports) {
+  var uri;
+  var normalizedUri;
+  var source;
+
+  for (uri in input) {
+    source = input[uri];
+    normalizedUri = normalizeUri(uri);
+
+    imports.push(restoreAsImport(normalizedUri));
+
+    context.sourcesContent[normalizedUri] = source.styles;
+
+    if (source.sourceMap) {
+      trackSourceMap(source.sourceMap, normalizedUri, context);
+    }
+  }
+
+  return imports;
+}
+
+function normalizeUri(uri) {
+  var currentPath = path.resolve('');
+  var absoluteUri;
+  var relativeToCurrentPath;
+  var normalizedUri;
+
+  if (isRemoteResource(uri)) {
+    return uri;
+  }
+
+  absoluteUri = path.isAbsolute(uri)
+    ? uri
+    : path.resolve(uri);
+  relativeToCurrentPath = path.relative(currentPath, absoluteUri);
+  normalizedUri = normalizePath(relativeToCurrentPath);
+
+  return normalizedUri;
+}
+
+function trackSourceMap(sourceMap, uri, context) {
+  var parsedMap = typeof sourceMap == 'string'
+    ? JSON.parse(sourceMap)
+    : sourceMap;
+  var rebasedMap = isRemoteResource(uri)
+    ? rebaseRemoteMap(parsedMap, uri)
+    : rebaseLocalMap(parsedMap, uri || UNKNOWN_URI, context.options.rebaseTo);
+
+  context.inputSourceMapTracker.track(uri, rebasedMap);
+}
+
+function restoreAsImport(uri) {
+  return restoreImport('url(' + uri + ')', '') + Marker.SEMICOLON;
+}
+
+function fromStyles(styles, context, parentInlinerContext, callback) {
+  var tokens;
+  var rebaseConfig = {};
+
+  if (!context.source) {
+    rebaseConfig.fromBase = path.resolve('');
+    rebaseConfig.toBase = context.options.rebaseTo;
+  } else if (isRemoteResource(context.source)) {
+    rebaseConfig.fromBase = context.source;
+    rebaseConfig.toBase = context.source;
+  } else if (path.isAbsolute(context.source)) {
+    rebaseConfig.fromBase = path.dirname(context.source);
+    rebaseConfig.toBase = context.options.rebaseTo;
+  } else {
+    rebaseConfig.fromBase = path.dirname(path.resolve(context.source));
+    rebaseConfig.toBase = context.options.rebaseTo;
+  }
+
+  tokens = tokenize(styles, context);
+  tokens = rebase(tokens, context.options.rebase, context.validator, rebaseConfig);
+
+  return allowsAnyImports(parentInlinerContext.inline)
+    ? inline(tokens, context, parentInlinerContext, callback)
+    : callback(tokens);
+}
+
+function allowsAnyImports(inline) {
+  return !(inline.length == 1 && inline[0] == 'none');
+}
+
+function inline(tokens, externalContext, parentInlinerContext, callback) {
+  var inlinerContext = {
+    afterContent: false,
+    callback: callback,
+    errors: externalContext.errors,
+    externalContext: externalContext,
+    fetch: externalContext.options.fetch,
+    inlinedStylesheets: parentInlinerContext.inlinedStylesheets || externalContext.inlinedStylesheets,
+    inline: parentInlinerContext.inline,
+    inlineRequest: externalContext.options.inlineRequest,
+    inlineTimeout: externalContext.options.inlineTimeout,
+    isRemote: parentInlinerContext.isRemote || false,
+    localOnly: externalContext.localOnly,
+    outputTokens: [],
+    rebaseTo: externalContext.options.rebaseTo,
+    sourceTokens: tokens,
+    warnings: externalContext.warnings
+  };
+
+  return doInlineImports(inlinerContext);
+}
+
+function doInlineImports(inlinerContext) {
+  var token;
+  var i, l;
+
+  for (i = 0, l = inlinerContext.sourceTokens.length; i < l; i++) {
+    token = inlinerContext.sourceTokens[i];
+
+    if (token[0] == Token.AT_RULE && isImport(token[1])) {
+      inlinerContext.sourceTokens.splice(0, i);
+      return inlineStylesheet(token, inlinerContext);
+    } if (token[0] == Token.AT_RULE || token[0] == Token.COMMENT) {
+      inlinerContext.outputTokens.push(token);
+    } else {
+      inlinerContext.outputTokens.push(token);
+      inlinerContext.afterContent = true;
+    }
+  }
+
+  inlinerContext.sourceTokens = [];
+  return inlinerContext.callback(inlinerContext.outputTokens);
+}
+
+function inlineStylesheet(token, inlinerContext) {
+  var uriAndMediaQuery = extractImportUrlAndMedia(token[1]);
+  var uri = uriAndMediaQuery[0];
+  var mediaQuery = uriAndMediaQuery[1];
+  var metadata = token[2];
+
+  return isRemoteResource(uri)
+    ? inlineRemoteStylesheet(uri, mediaQuery, metadata, inlinerContext)
+    : inlineLocalStylesheet(uri, mediaQuery, metadata, inlinerContext);
+}
+
+function inlineRemoteStylesheet(uri, mediaQuery, metadata, inlinerContext) {
+  var isAllowed = isAllowedResource(uri, true, inlinerContext.inline);
+  var originalUri = uri;
+  var isLoaded = uri in inlinerContext.externalContext.sourcesContent;
+  var isRuntimeResource = !hasProtocol(uri);
+
+  if (inlinerContext.inlinedStylesheets.indexOf(uri) > -1) {
+    inlinerContext.warnings.push('Ignoring remote @import of "' + uri + '" as it has already been imported.');
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } if (inlinerContext.localOnly && inlinerContext.afterContent) {
+    inlinerContext.warnings.push('Ignoring remote @import of "' + uri + '" as no callback given and after other content.');
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } if (isRuntimeResource) {
+    inlinerContext.warnings.push('Skipping remote @import of "' + uri + '" as no protocol given.');
+    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } if (inlinerContext.localOnly && !isLoaded) {
+    inlinerContext.warnings.push('Skipping remote @import of "' + uri + '" as no callback given.');
+    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } if (!isAllowed && inlinerContext.afterContent) {
+    inlinerContext.warnings.push('Ignoring remote @import of "' + uri + '" as resource is not allowed and after other content.');
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } if (!isAllowed) {
+    inlinerContext.warnings.push('Skipping remote @import of "' + uri + '" as resource is not allowed.');
+    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  }
+
+  inlinerContext.inlinedStylesheets.push(uri);
+
+  function whenLoaded(error, importedStyles) {
+    if (error) {
+      inlinerContext.errors.push('Broken @import declaration of "' + uri + '" - ' + error);
+
+      return process.nextTick(function() {
+        inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+        inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+        doInlineImports(inlinerContext);
+      });
+    }
+
+    inlinerContext.inline = inlinerContext.externalContext.options.inline;
+    inlinerContext.isRemote = true;
+
+    inlinerContext.externalContext.source = originalUri;
+    inlinerContext.externalContext.sourcesContent[uri] = importedStyles;
+    inlinerContext.externalContext.stats.originalSize += importedStyles.length;
+
+    return fromStyles(importedStyles, inlinerContext.externalContext, inlinerContext, function(importedTokens) {
+      importedTokens = wrapInMedia(importedTokens, mediaQuery, metadata);
+
+      inlinerContext.outputTokens = inlinerContext.outputTokens.concat(importedTokens);
+      inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+
+      return doInlineImports(inlinerContext);
+    });
+  }
+
+  return isLoaded
+    ? whenLoaded(null, inlinerContext.externalContext.sourcesContent[uri])
+    : inlinerContext.fetch(uri, inlinerContext.inlineRequest, inlinerContext.inlineTimeout, whenLoaded);
+}
+
+function inlineLocalStylesheet(uri, mediaQuery, metadata, inlinerContext) {
+  var protocolLessUri = uri.replace(FILE_RESOURCE_PROTOCOL, '');
+  var currentPath = path.resolve('');
+  var absoluteUri = path.isAbsolute(protocolLessUri)
+    ? path.resolve(currentPath, protocolLessUri[0] == '/' ? protocolLessUri.substring(1) : protocolLessUri)
+    : path.resolve(inlinerContext.rebaseTo, protocolLessUri);
+  var relativeToCurrentPath = path.relative(currentPath, absoluteUri);
+  var importedStyles;
+  var isAllowed = isAllowedResource(protocolLessUri, false, inlinerContext.inline);
+  var normalizedPath = normalizePath(relativeToCurrentPath);
+  var isLoaded = normalizedPath in inlinerContext.externalContext.sourcesContent;
+
+  if (inlinerContext.inlinedStylesheets.indexOf(absoluteUri) > -1) {
+    inlinerContext.warnings.push('Ignoring local @import of "' + protocolLessUri + '" as it has already been imported.');
+  } else if (isAllowed && !isLoaded && (!fs.existsSync(absoluteUri) || !fs.statSync(absoluteUri).isFile())) {
+    inlinerContext.errors.push('Ignoring local @import of "' + protocolLessUri + '" as resource is missing.');
+  } else if (!isAllowed && inlinerContext.afterContent) {
+    inlinerContext.warnings.push('Ignoring local @import of "' + protocolLessUri + '" as resource is not allowed and after other content.');
+  } else if (inlinerContext.afterContent) {
+    inlinerContext.warnings.push('Ignoring local @import of "' + protocolLessUri + '" as after other content.');
+  } else if (!isAllowed) {
+    inlinerContext.warnings.push('Skipping local @import of "' + protocolLessUri + '" as resource is not allowed.');
+    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+  } else {
+    importedStyles = isLoaded
+      ? inlinerContext.externalContext.sourcesContent[normalizedPath]
+      : fs.readFileSync(absoluteUri, 'utf-8');
+
+    if (importedStyles.charCodeAt(0) === 65279) {
+      importedStyles = importedStyles.substring(1);
+    }
+
+    inlinerContext.inlinedStylesheets.push(absoluteUri);
+    inlinerContext.inline = inlinerContext.externalContext.options.inline;
+
+    inlinerContext.externalContext.source = normalizedPath;
+    inlinerContext.externalContext.sourcesContent[normalizedPath] = importedStyles;
+    inlinerContext.externalContext.stats.originalSize += importedStyles.length;
+
+    return fromStyles(importedStyles, inlinerContext.externalContext, inlinerContext, function(importedTokens) {
+      importedTokens = wrapInMedia(importedTokens, mediaQuery, metadata);
+
+      inlinerContext.outputTokens = inlinerContext.outputTokens.concat(importedTokens);
+      inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+
+      return doInlineImports(inlinerContext);
+    });
+  }
+
+  inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+
+  return doInlineImports(inlinerContext);
+}
+
+function wrapInMedia(tokens, mediaQuery, metadata) {
+  if (mediaQuery) {
+    return [[Token.NESTED_BLOCK, [[Token.NESTED_BLOCK_SCOPE, '@media ' + mediaQuery, metadata]], tokens]];
+  }
+  return tokens;
+}
+
+module.exports = readSources;
Index: imaps-frontend/node_modules/clean-css/lib/reader/rebase-local-map.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/rebase-local-map.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/rebase-local-map.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,15 @@
+var path = require('path');
+
+function rebaseLocalMap(sourceMap, sourceUri, rebaseTo) {
+  var currentPath = path.resolve('');
+  var absoluteUri = path.resolve(currentPath, sourceUri);
+  var absoluteUriDirectory = path.dirname(absoluteUri);
+
+  sourceMap.sources = sourceMap.sources.map(function(source) {
+    return path.relative(rebaseTo, path.resolve(absoluteUriDirectory, source));
+  });
+
+  return sourceMap;
+}
+
+module.exports = rebaseLocalMap;
Index: imaps-frontend/node_modules/clean-css/lib/reader/rebase-remote-map.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/rebase-remote-map.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/rebase-remote-map.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,14 @@
+var path = require('path');
+var url = require('url');
+
+function rebaseRemoteMap(sourceMap, sourceUri) {
+  var sourceDirectory = path.dirname(sourceUri);
+
+  sourceMap.sources = sourceMap.sources.map(function(source) {
+    return url.resolve(sourceDirectory, source);
+  });
+
+  return sourceMap;
+}
+
+module.exports = rebaseRemoteMap;
Index: imaps-frontend/node_modules/clean-css/lib/reader/rebase.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/rebase.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/rebase.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,101 @@
+var extractImportUrlAndMedia = require('./extract-import-url-and-media');
+var restoreImport = require('./restore-import');
+var rewriteUrl = require('./rewrite-url');
+
+var Token = require('../tokenizer/token');
+var isImport = require('../utils/is-import');
+
+var SOURCE_MAP_COMMENT_PATTERN = /^\/\*# sourceMappingURL=(\S+) \*\/$/;
+
+function rebase(tokens, rebaseAll, validator, rebaseConfig) {
+  return rebaseAll
+    ? rebaseEverything(tokens, validator, rebaseConfig)
+    : rebaseAtRules(tokens, validator, rebaseConfig);
+}
+
+function rebaseEverything(tokens, validator, rebaseConfig) {
+  var token;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+
+    switch (token[0]) {
+    case Token.AT_RULE:
+      rebaseAtRule(token, validator, rebaseConfig);
+      break;
+    case Token.AT_RULE_BLOCK:
+      rebaseProperties(token[2], validator, rebaseConfig);
+      break;
+    case Token.COMMENT:
+      rebaseSourceMapComment(token, rebaseConfig);
+      break;
+    case Token.NESTED_BLOCK:
+      rebaseEverything(token[2], validator, rebaseConfig);
+      break;
+    case Token.RULE:
+      rebaseProperties(token[2], validator, rebaseConfig);
+      break;
+    }
+  }
+
+  return tokens;
+}
+
+function rebaseAtRules(tokens, validator, rebaseConfig) {
+  var token;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+
+    switch (token[0]) {
+    case Token.AT_RULE:
+      rebaseAtRule(token, validator, rebaseConfig);
+      break;
+    }
+  }
+
+  return tokens;
+}
+
+function rebaseAtRule(token, validator, rebaseConfig) {
+  if (!isImport(token[1])) {
+    return;
+  }
+
+  var uriAndMediaQuery = extractImportUrlAndMedia(token[1]);
+  var newUrl = rewriteUrl(uriAndMediaQuery[0], rebaseConfig);
+  var mediaQuery = uriAndMediaQuery[1];
+
+  token[1] = restoreImport(newUrl, mediaQuery);
+}
+
+function rebaseSourceMapComment(token, rebaseConfig) {
+  var matches = SOURCE_MAP_COMMENT_PATTERN.exec(token[1]);
+
+  if (matches && matches[1].indexOf('data:') === -1) {
+    token[1] = token[1].replace(matches[1], rewriteUrl(matches[1], rebaseConfig, true));
+  }
+}
+
+function rebaseProperties(properties, validator, rebaseConfig) {
+  var property;
+  var value;
+  var i, l;
+  var j, m;
+
+  for (i = 0, l = properties.length; i < l; i++) {
+    property = properties[i];
+
+    for (j = 2 /* 0 is Token.PROPERTY, 1 is name */, m = property.length; j < m; j++) {
+      value = property[j][1];
+
+      if (validator.isUrl(value)) {
+        property[j][1] = rewriteUrl(value, rebaseConfig);
+      }
+    }
+  }
+}
+
+module.exports = rebase;
Index: imaps-frontend/node_modules/clean-css/lib/reader/restore-import.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/restore-import.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/restore-import.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,5 @@
+function restoreImport(uri, mediaQuery) {
+  return ('@import ' + uri + ' ' + mediaQuery).trim();
+}
+
+module.exports = restoreImport;
Index: imaps-frontend/node_modules/clean-css/lib/reader/rewrite-url.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/reader/rewrite-url.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/reader/rewrite-url.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,112 @@
+var path = require('path');
+var url = require('url');
+
+var isDataUriResource = require('../utils/is-data-uri-resource');
+
+var DOUBLE_QUOTE = '"';
+var SINGLE_QUOTE = '\'';
+var URL_PREFIX = 'url(';
+var URL_SUFFIX = ')';
+
+var PROTOCOL_LESS_PREFIX_PATTERN = /^[^\w\d]*\/\//;
+var QUOTE_PREFIX_PATTERN = /^["']/;
+var QUOTE_SUFFIX_PATTERN = /["']$/;
+var ROUND_BRACKETS_PATTERN = /[()]/;
+var URL_PREFIX_PATTERN = /^url\(/i;
+var URL_SUFFIX_PATTERN = /\)$/;
+var WHITESPACE_PATTERN = /\s/;
+
+var isWindows = process.platform == 'win32';
+
+function rebase(uri, rebaseConfig) {
+  if (!rebaseConfig) {
+    return uri;
+  }
+
+  if (isAbsolute(uri) && !isRemote(rebaseConfig.toBase)) {
+    return uri;
+  }
+
+  if (isRemote(uri) || isSVGMarker(uri) || isInternal(uri) || isDataUriResource(uri)) {
+    return uri;
+  }
+
+  if (isRemote(rebaseConfig.toBase)) {
+    return url.resolve(rebaseConfig.toBase, uri);
+  }
+
+  return rebaseConfig.absolute
+    ? normalize(absolute(uri, rebaseConfig))
+    : normalize(relative(uri, rebaseConfig));
+}
+
+function isAbsolute(uri) {
+  return path.isAbsolute(uri);
+}
+
+function isSVGMarker(uri) {
+  return uri[0] == '#';
+}
+
+function isInternal(uri) {
+  return /^\w+:\w+/.test(uri);
+}
+
+function isRemote(uri) {
+  return /^[^:]+?:\/\//.test(uri) || PROTOCOL_LESS_PREFIX_PATTERN.test(uri);
+}
+
+function absolute(uri, rebaseConfig) {
+  return path
+    .resolve(path.join(rebaseConfig.fromBase || '', uri))
+    .replace(rebaseConfig.toBase, '');
+}
+
+function relative(uri, rebaseConfig) {
+  return path.relative(rebaseConfig.toBase, path.join(rebaseConfig.fromBase || '', uri));
+}
+
+function normalize(uri) {
+  return isWindows ? uri.replace(/\\/g, '/') : uri;
+}
+
+function quoteFor(unquotedUrl) {
+  if (unquotedUrl.indexOf(SINGLE_QUOTE) > -1) {
+    return DOUBLE_QUOTE;
+  } if (unquotedUrl.indexOf(DOUBLE_QUOTE) > -1) {
+    return SINGLE_QUOTE;
+  } if (hasWhitespace(unquotedUrl) || hasRoundBrackets(unquotedUrl)) {
+    return SINGLE_QUOTE;
+  }
+  return '';
+}
+
+function hasWhitespace(url) {
+  return WHITESPACE_PATTERN.test(url);
+}
+
+function hasRoundBrackets(url) {
+  return ROUND_BRACKETS_PATTERN.test(url);
+}
+
+function rewriteUrl(originalUrl, rebaseConfig, pathOnly) {
+  var strippedUrl = originalUrl
+    .replace(URL_PREFIX_PATTERN, '')
+    .replace(URL_SUFFIX_PATTERN, '')
+    .trim();
+
+  var unquotedUrl = strippedUrl
+    .replace(QUOTE_PREFIX_PATTERN, '')
+    .replace(QUOTE_SUFFIX_PATTERN, '')
+    .trim();
+
+  var quote = strippedUrl[0] == SINGLE_QUOTE || strippedUrl[0] == DOUBLE_QUOTE
+    ? strippedUrl[0]
+    : quoteFor(unquotedUrl);
+
+  return pathOnly
+    ? rebase(unquotedUrl, rebaseConfig)
+    : URL_PREFIX + quote + rebase(unquotedUrl, rebaseConfig) + quote + URL_SUFFIX;
+}
+
+module.exports = rewriteUrl;
Index: imaps-frontend/node_modules/clean-css/lib/tokenizer/marker.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/tokenizer/marker.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/tokenizer/marker.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,26 @@
+var Marker = {
+  ASTERISK: '*',
+  AT: '@',
+  BACK_SLASH: '\\',
+  CARRIAGE_RETURN: '\r',
+  CLOSE_CURLY_BRACKET: '}',
+  CLOSE_ROUND_BRACKET: ')',
+  CLOSE_SQUARE_BRACKET: ']',
+  COLON: ':',
+  COMMA: ',',
+  DOUBLE_QUOTE: '"',
+  EXCLAMATION: '!',
+  FORWARD_SLASH: '/',
+  INTERNAL: '-clean-css-',
+  NEW_LINE_NIX: '\n',
+  OPEN_CURLY_BRACKET: '{',
+  OPEN_ROUND_BRACKET: '(',
+  OPEN_SQUARE_BRACKET: '[',
+  SEMICOLON: ';',
+  SINGLE_QUOTE: '\'',
+  SPACE: ' ',
+  TAB: '\t',
+  UNDERSCORE: '_'
+};
+
+module.exports = Marker;
Index: imaps-frontend/node_modules/clean-css/lib/tokenizer/token.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/tokenizer/token.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/tokenizer/token.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,17 @@
+var Token = {
+  AT_RULE: 'at-rule', // e.g. `@import`, `@charset`
+  AT_RULE_BLOCK: 'at-rule-block', // e.g. `@font-face{...}`
+  AT_RULE_BLOCK_SCOPE: 'at-rule-block-scope', // e.g. `@font-face`
+  COMMENT: 'comment', // e.g. `/* comment */`
+  NESTED_BLOCK: 'nested-block', // e.g. `@media screen{...}`, `@keyframes animation {...}`
+  NESTED_BLOCK_SCOPE: 'nested-block-scope', // e.g. `@media`, `@keyframes`
+  PROPERTY: 'property', // e.g. `color:red`
+  PROPERTY_BLOCK: 'property-block', // e.g. `--var:{color:red}`
+  PROPERTY_NAME: 'property-name', // e.g. `color`
+  PROPERTY_VALUE: 'property-value', // e.g. `red`
+  RAW: 'raw', // e.g. anything between /* clean-css ignore:start */ and /* clean-css ignore:end */ comments
+  RULE: 'rule', // e.g `div > a{...}`
+  RULE_SCOPE: 'rule-scope' // e.g `div > a`
+};
+
+module.exports = Token;
Index: imaps-frontend/node_modules/clean-css/lib/tokenizer/tokenize.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/tokenizer/tokenize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/tokenizer/tokenize.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,867 @@
+var Marker = require('./marker');
+var Token = require('./token');
+
+var formatPosition = require('../utils/format-position');
+
+var Level = {
+  BLOCK: 'block',
+  COMMENT: 'comment',
+  DOUBLE_QUOTE: 'double-quote',
+  RULE: 'rule',
+  SINGLE_QUOTE: 'single-quote'
+};
+
+var AT_RULES = [
+  '@charset',
+  '@import'
+];
+
+var BLOCK_RULES = [
+  '@-moz-document',
+  '@document',
+  '@-moz-keyframes',
+  '@-ms-keyframes',
+  '@-o-keyframes',
+  '@-webkit-keyframes',
+  '@keyframes',
+  '@media',
+  '@supports',
+  '@container',
+  '@layer'
+];
+
+var IGNORE_END_COMMENT_PATTERN = /\/\* clean-css ignore:end \*\/$/;
+var IGNORE_START_COMMENT_PATTERN = /^\/\* clean-css ignore:start \*\//;
+
+var PAGE_MARGIN_BOXES = [
+  '@bottom-center',
+  '@bottom-left',
+  '@bottom-left-corner',
+  '@bottom-right',
+  '@bottom-right-corner',
+  '@left-bottom',
+  '@left-middle',
+  '@left-top',
+  '@right-bottom',
+  '@right-middle',
+  '@right-top',
+  '@top-center',
+  '@top-left',
+  '@top-left-corner',
+  '@top-right',
+  '@top-right-corner'
+];
+
+var EXTRA_PAGE_BOXES = [
+  '@footnote',
+  '@footnotes',
+  '@left',
+  '@page-float-bottom',
+  '@page-float-top',
+  '@right'
+];
+
+var REPEAT_PATTERN = /^\[\s{0,31}\d+\s{0,31}\]$/;
+var TAIL_BROKEN_VALUE_PATTERN = /([^}])\}*$/;
+var RULE_WORD_SEPARATOR_PATTERN = /[\s(]/;
+
+function tokenize(source, externalContext) {
+  var internalContext = {
+    level: Level.BLOCK,
+    position: {
+      source: externalContext.source || undefined,
+      line: 1,
+      column: 0,
+      index: 0
+    }
+  };
+
+  return intoTokens(source, externalContext, internalContext, false);
+}
+
+function intoTokens(source, externalContext, internalContext, isNested) {
+  var allTokens = [];
+  var newTokens = allTokens;
+  var lastToken;
+  var ruleToken;
+  var ruleTokens = [];
+  var propertyToken;
+  var metadata;
+  var metadatas = [];
+  var level = internalContext.level;
+  var levels = [];
+  var buffer = [];
+  var buffers = [];
+  var isBufferEmpty = true;
+  var serializedBuffer;
+  var serializedBufferPart;
+  var roundBracketLevel = 0;
+  var isQuoted;
+  var isSpace;
+  var isNewLineNix;
+  var isNewLineWin;
+  var isCarriageReturn;
+  var isCommentStart;
+  var wasCommentStart = false;
+  var isCommentEnd;
+  var wasCommentEnd = false;
+  var isCommentEndMarker;
+  var isEscaped;
+  var wasEscaped = false;
+  var characterWithNoSpecialMeaning;
+  var isPreviousDash = false;
+  var isVariable = false;
+  var isRaw = false;
+  var seekingValue = false;
+  var seekingPropertyBlockClosing = false;
+  var position = internalContext.position;
+  var lastCommentStartAt;
+
+  for (; position.index < source.length; position.index++) {
+    var character = source[position.index];
+
+    isQuoted = level == Level.SINGLE_QUOTE || level == Level.DOUBLE_QUOTE;
+    isSpace = character == Marker.SPACE || character == Marker.TAB;
+    isNewLineNix = character == Marker.NEW_LINE_NIX;
+    isNewLineWin = character == Marker.NEW_LINE_NIX
+      && source[position.index - 1] == Marker.CARRIAGE_RETURN;
+    isCarriageReturn = character == Marker.CARRIAGE_RETURN
+      && source[position.index + 1] && source[position.index + 1] != Marker.NEW_LINE_NIX;
+    isCommentStart = !wasCommentEnd
+      && level != Level.COMMENT && !isQuoted
+      && character == Marker.ASTERISK && source[position.index - 1] == Marker.FORWARD_SLASH;
+    isCommentEndMarker = !wasCommentStart
+      && !isQuoted && character == Marker.FORWARD_SLASH
+      && source[position.index - 1] == Marker.ASTERISK;
+    isCommentEnd = level == Level.COMMENT && isCommentEndMarker;
+    characterWithNoSpecialMeaning = !isSpace && !isCarriageReturn && (character >= 'A' && character <= 'Z' || character >= 'a' && character <= 'z' || character >= '0' && character <= '9' || character == '-');
+    isVariable = isVariable || (level != Level.COMMENT && !seekingValue && isPreviousDash && character === '-' && buffer.length === 1);
+    isPreviousDash = character === '-';
+    roundBracketLevel = Math.max(roundBracketLevel, 0);
+
+    metadata = isBufferEmpty
+      ? [position.line, position.column, position.source]
+      : metadata;
+
+    if (isEscaped) {
+      // previous character was a backslash
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (characterWithNoSpecialMeaning) {
+      // it's just an alphanumeric character or a hyphen (part of any rule or property name) so let's end it quickly
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if ((isSpace || isNewLineNix && !isNewLineWin) && (isQuoted || level == Level.COMMENT)) {
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if ((isSpace || isNewLineNix && !isNewLineWin) && isBufferEmpty) {
+      // noop
+    } else if (!isCommentEnd && level == Level.COMMENT) {
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (!isCommentStart && !isCommentEnd && isRaw) {
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (isCommentStart
+        && isVariable
+        && (level == Level.BLOCK || level == Level.RULE) && buffer.length > 1) {
+      // comment start within a variable, e.g. var(/*<--
+      buffer.push(character);
+      isBufferEmpty = false;
+
+      levels.push(level);
+      level = Level.COMMENT;
+    } else if (isCommentStart && (level == Level.BLOCK || level == Level.RULE) && buffer.length > 1) {
+      // comment start within block preceded by some content, e.g. div/*<--
+      metadatas.push(metadata);
+      buffer.push(character);
+      buffers.push(buffer.slice(0, -2));
+      isBufferEmpty = false;
+
+      buffer = buffer.slice(-2);
+      metadata = [position.line, position.column - 1, position.source];
+
+      levels.push(level);
+      level = Level.COMMENT;
+    } else if (isCommentStart) {
+      // comment start, e.g. /*<--
+      levels.push(level);
+      level = Level.COMMENT;
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (isCommentEnd && isVariable) {
+      // comment end within a variable, e.g. var(/*!*/<--
+      buffer.push(character);
+      level = levels.pop();
+    } else if (isCommentEnd && isIgnoreStartComment(buffer)) {
+      // ignore:start comment end, e.g. /* clean-css ignore:start */<--
+      serializedBuffer = buffer.join('').trim() + character;
+      lastToken = [
+        Token.COMMENT,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ];
+      newTokens.push(lastToken);
+
+      isRaw = true;
+      metadata = metadatas.pop() || null;
+      buffer = buffers.pop() || [];
+      isBufferEmpty = buffer.length === 0;
+    } else if (isCommentEnd && isIgnoreEndComment(buffer)) {
+      // ignore:start comment end, e.g. /* clean-css ignore:end */<--
+      serializedBuffer = buffer.join('') + character;
+      lastCommentStartAt = serializedBuffer.lastIndexOf(Marker.FORWARD_SLASH + Marker.ASTERISK);
+
+      serializedBufferPart = serializedBuffer.substring(0, lastCommentStartAt);
+      lastToken = [
+        Token.RAW,
+        serializedBufferPart,
+        [originalMetadata(metadata, serializedBufferPart, externalContext)]
+      ];
+      newTokens.push(lastToken);
+
+      serializedBufferPart = serializedBuffer.substring(lastCommentStartAt);
+      metadata = [position.line, position.column - serializedBufferPart.length + 1, position.source];
+      lastToken = [
+        Token.COMMENT,
+        serializedBufferPart,
+        [originalMetadata(metadata, serializedBufferPart, externalContext)]
+      ];
+      newTokens.push(lastToken);
+
+      isRaw = false;
+      level = levels.pop();
+      metadata = metadatas.pop() || null;
+      buffer = buffers.pop() || [];
+      isBufferEmpty = buffer.length === 0;
+    } else if (isCommentEnd) {
+      // comment end, e.g. /* comment */<--
+      serializedBuffer = buffer.join('').trim() + character;
+      lastToken = [
+        Token.COMMENT,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ];
+      newTokens.push(lastToken);
+
+      level = levels.pop();
+      metadata = metadatas.pop() || null;
+      buffer = buffers.pop() || [];
+      isBufferEmpty = buffer.length === 0;
+    } else if (isCommentEndMarker && source[position.index + 1] != Marker.ASTERISK) {
+      externalContext.warnings.push('Unexpected \'*/\' at ' + formatPosition([position.line, position.column, position.source]) + '.');
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.SINGLE_QUOTE && !isQuoted) {
+      // single quotation start, e.g. a[href^='https<--
+      levels.push(level);
+      level = Level.SINGLE_QUOTE;
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (character == Marker.SINGLE_QUOTE && level == Level.SINGLE_QUOTE) {
+      // single quotation end, e.g. a[href^='https'<--
+      level = levels.pop();
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (character == Marker.DOUBLE_QUOTE && !isQuoted) {
+      // double quotation start, e.g. a[href^="<--
+      levels.push(level);
+      level = Level.DOUBLE_QUOTE;
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (character == Marker.DOUBLE_QUOTE && level == Level.DOUBLE_QUOTE) {
+      // double quotation end, e.g. a[href^="https"<--
+      level = levels.pop();
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (character != Marker.CLOSE_ROUND_BRACKET
+      && character != Marker.OPEN_ROUND_BRACKET
+      && level != Level.COMMENT && !isQuoted && roundBracketLevel > 0) {
+      // character inside any function, e.g. hsla(.<--
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (character == Marker.OPEN_ROUND_BRACKET
+      && !isQuoted && level != Level.COMMENT
+      && !seekingValue) {
+      // round open bracket, e.g. @import url(<--
+      buffer.push(character);
+      isBufferEmpty = false;
+
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET
+      && !isQuoted
+      && level != Level.COMMENT
+      && !seekingValue) {
+      // round open bracket, e.g. @import url(test.css)<--
+      buffer.push(character);
+      isBufferEmpty = false;
+
+      roundBracketLevel--;
+    } else if (character == Marker.SEMICOLON && level == Level.BLOCK && buffer[0] == Marker.AT) {
+      // semicolon ending rule at block level, e.g. @import '...';<--
+      serializedBuffer = buffer.join('').trim();
+      allTokens.push([
+        Token.AT_RULE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.COMMA && level == Level.BLOCK && ruleToken) {
+      // comma separator at block level, e.g. a,div,<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken[1].push([
+        tokenScopeFrom(ruleToken[0]),
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext, ruleToken[1].length)]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.COMMA && level == Level.BLOCK && tokenTypeFrom(buffer) == Token.AT_RULE) {
+      // comma separator at block level, e.g. @import url(...) screen,<--
+      // keep iterating as end semicolon will create the token
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (character == Marker.COMMA && level == Level.BLOCK) {
+      // comma separator at block level, e.g. a,<--
+      ruleToken = [tokenTypeFrom(buffer), [], []];
+      serializedBuffer = buffer.join('').trim();
+      ruleToken[1].push([
+        tokenScopeFrom(ruleToken[0]),
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext, 0)]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.OPEN_CURLY_BRACKET
+      && level == Level.BLOCK
+      && ruleToken
+      && ruleToken[0] == Token.NESTED_BLOCK) {
+      // open brace opening at-rule at block level, e.g. @media{<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken[1].push([
+        Token.NESTED_BLOCK_SCOPE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+      allTokens.push(ruleToken);
+
+      levels.push(level);
+      position.column++;
+      position.index++;
+      buffer = [];
+      isBufferEmpty = true;
+
+      ruleToken[2] = intoTokens(source, externalContext, internalContext, true);
+      ruleToken = null;
+    } else if (character == Marker.OPEN_CURLY_BRACKET
+      && level == Level.BLOCK
+      && tokenTypeFrom(buffer) == Token.NESTED_BLOCK) {
+      // open brace opening at-rule at block level, e.g. @media{<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken = ruleToken || [Token.NESTED_BLOCK, [], []];
+      ruleToken[1].push([
+        Token.NESTED_BLOCK_SCOPE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+      allTokens.push(ruleToken);
+
+      levels.push(level);
+      position.column++;
+      position.index++;
+      buffer = [];
+      isBufferEmpty = true;
+      isVariable = false;
+
+      ruleToken[2] = intoTokens(source, externalContext, internalContext, true);
+      ruleToken = null;
+    } else if (character == Marker.OPEN_CURLY_BRACKET && level == Level.BLOCK) {
+      // open brace opening rule at block level, e.g. div{<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken = ruleToken || [tokenTypeFrom(buffer), [], []];
+      ruleToken[1].push([
+        tokenScopeFrom(ruleToken[0]),
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext, ruleToken[1].length)]
+      ]);
+      newTokens = ruleToken[2];
+      allTokens.push(ruleToken);
+
+      levels.push(level);
+      level = Level.RULE;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.OPEN_CURLY_BRACKET && level == Level.RULE && seekingValue) {
+      // open brace opening rule at rule level, e.g. div{--variable:{<--
+      ruleTokens.push(ruleToken);
+      ruleToken = [Token.PROPERTY_BLOCK, []];
+      propertyToken.push(ruleToken);
+      newTokens = ruleToken[1];
+
+      levels.push(level);
+      level = Level.RULE;
+      seekingValue = false;
+    } else if (character == Marker.OPEN_CURLY_BRACKET && level == Level.RULE && isPageMarginBox(buffer)) {
+      // open brace opening page-margin box at rule level, e.g. @page{@top-center{<--
+      serializedBuffer = buffer.join('').trim();
+      ruleTokens.push(ruleToken);
+      ruleToken = [Token.AT_RULE_BLOCK, [], []];
+      ruleToken[1].push([
+        Token.AT_RULE_BLOCK_SCOPE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+      newTokens.push(ruleToken);
+      newTokens = ruleToken[2];
+
+      levels.push(level);
+      level = Level.RULE;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.COLON && level == Level.RULE && !seekingValue) {
+      // colon at rule level, e.g. a{color:<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken = [
+        Token.PROPERTY,
+        [
+          Token.PROPERTY_NAME,
+          serializedBuffer,
+          [originalMetadata(metadata, serializedBuffer, externalContext)]
+        ]
+      ];
+      newTokens.push(propertyToken);
+
+      seekingValue = true;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.SEMICOLON
+      && level == Level.RULE
+      && propertyToken
+      && ruleTokens.length > 0
+      && !isBufferEmpty
+      && buffer[0] == Marker.AT) {
+      // semicolon at rule level for at-rule, e.g. a{--color:{@apply(--other-color);<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken[1].push([
+        Token.AT_RULE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && propertyToken && !isBufferEmpty) {
+      // semicolon at rule level, e.g. a{color:red;<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+
+      propertyToken = null;
+      seekingValue = false;
+      buffer = [];
+      isBufferEmpty = true;
+      isVariable = false;
+    } else if (character == Marker.SEMICOLON
+      && level == Level.RULE
+      && propertyToken
+      && isBufferEmpty
+      && isVariable
+      && !propertyToken[2]) {
+      // semicolon after empty variable value at rule level, e.g. a{--color: ;<--
+      propertyToken.push([Token.PROPERTY_VALUE, ' ', [originalMetadata(metadata, ' ', externalContext)]]);
+      isVariable = false;
+      propertyToken = null;
+      seekingValue = false;
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && propertyToken && isBufferEmpty) {
+      // semicolon after bracketed value at rule level, e.g. a{color:rgb(...);<--
+      propertyToken = null;
+      seekingValue = false;
+    } else if (character == Marker.SEMICOLON
+      && level == Level.RULE
+      && !isBufferEmpty
+      && buffer[0] == Marker.AT) {
+      // semicolon for at-rule at rule level, e.g. a{@apply(--variable);<--
+      serializedBuffer = buffer.join('');
+      newTokens.push([
+        Token.AT_RULE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+
+      seekingValue = false;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && seekingPropertyBlockClosing) {
+      // close brace after a property block at rule level, e.g. a{--custom:{color:red;};<--
+      seekingPropertyBlockClosing = false;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && isBufferEmpty) {
+      // stray semicolon at rule level, e.g. a{;<--
+      // noop
+    } else if (character == Marker.CLOSE_CURLY_BRACKET
+      && level == Level.RULE
+      && propertyToken
+      && seekingValue
+      && !isBufferEmpty && ruleTokens.length > 0) {
+      // close brace at rule level, e.g. a{--color:{color:red}<--
+      serializedBuffer = buffer.join('');
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = ruleToken[2];
+
+      level = levels.pop();
+      seekingValue = false;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET
+      && level == Level.RULE
+      && propertyToken
+      && !isBufferEmpty
+      && buffer[0] == Marker.AT
+      && ruleTokens.length > 0) {
+      // close brace at rule level for at-rule, e.g. a{--color:{@apply(--other-color)}<--
+      serializedBuffer = buffer.join('');
+      ruleToken[1].push([
+        Token.AT_RULE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = ruleToken[2];
+
+      level = levels.pop();
+      seekingValue = false;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET
+      && level == Level.RULE
+      && propertyToken
+      && ruleTokens.length > 0) {
+      // close brace at rule level after space, e.g. a{--color:{color:red }<--
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = ruleToken[2];
+
+      level = levels.pop();
+      seekingValue = false;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET
+      && level == Level.RULE
+      && propertyToken
+      && !isBufferEmpty) {
+      // close brace at rule level, e.g. a{color:red}<--
+      serializedBuffer = buffer.join('');
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = allTokens;
+
+      level = levels.pop();
+      seekingValue = false;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET
+      && level == Level.RULE
+      && !isBufferEmpty
+      && buffer[0] == Marker.AT) {
+      // close brace after at-rule at rule level, e.g. a{@apply(--variable)}<--
+      propertyToken = null;
+      ruleToken = null;
+      serializedBuffer = buffer.join('').trim();
+      newTokens.push([
+        Token.AT_RULE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+      newTokens = allTokens;
+
+      level = levels.pop();
+      seekingValue = false;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET
+      && level == Level.RULE
+      && levels[levels.length - 1] == Level.RULE) {
+      // close brace after a property block at rule level, e.g. a{--custom:{color:red;}<--
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = ruleToken[2];
+
+      level = levels.pop();
+      seekingValue = false;
+      seekingPropertyBlockClosing = true;
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET
+      && level == Level.RULE
+      && isVariable
+      && propertyToken
+      && !propertyToken[2]) {
+      // close brace after an empty variable declaration inside a rule, e.g. a{--color: }<--
+      propertyToken.push([Token.PROPERTY_VALUE, ' ', [originalMetadata(metadata, ' ', externalContext)]]);
+      isVariable = false;
+      propertyToken = null;
+      ruleToken = null;
+      newTokens = allTokens;
+
+      level = levels.pop();
+      seekingValue = false;
+      isVariable = false;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.RULE) {
+      // close brace after a rule, e.g. a{color:red;}<--
+      propertyToken = null;
+      ruleToken = null;
+      newTokens = allTokens;
+
+      level = levels.pop();
+      seekingValue = false;
+      isVariable = false;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET
+      && level == Level.BLOCK
+      && !isNested
+      && position.index <= source.length - 1) {
+      // stray close brace at block level, e.g. a{color:red}color:blue}<--
+      externalContext.warnings.push('Unexpected \'}\' at ' + formatPosition([position.line, position.column, position.source]) + '.');
+      buffer.push(character);
+      isBufferEmpty = false;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.BLOCK) {
+      // close brace at block level, e.g. @media screen {...}<--
+      break;
+    } else if (character == Marker.OPEN_ROUND_BRACKET && level == Level.RULE && seekingValue) {
+      // round open bracket, e.g. a{color:hsla(<--
+      buffer.push(character);
+      isBufferEmpty = false;
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET
+      && level == Level.RULE
+      && seekingValue
+      && roundBracketLevel == 1) {
+      // round close bracket, e.g. a{color:hsla(0,0%,0%)<--
+      buffer.push(character);
+      isBufferEmpty = false;
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+
+      roundBracketLevel--;
+      buffer = [];
+      isBufferEmpty = true;
+      isVariable = false;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && level == Level.RULE && seekingValue) {
+      // round close bracket within other brackets, e.g. a{width:calc((10rem / 2)<--
+      buffer.push(character);
+      isBufferEmpty = false;
+      isVariable = false;
+      roundBracketLevel--;
+    } else if (character == Marker.FORWARD_SLASH
+      && source[position.index + 1] != Marker.ASTERISK
+      && level == Level.RULE
+      && seekingValue
+      && !isBufferEmpty) {
+      // forward slash within a property, e.g. a{background:url(image.png) 0 0/<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        character,
+        [[position.line, position.column, position.source]]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.FORWARD_SLASH
+      && source[position.index + 1] != Marker.ASTERISK
+      && level == Level.RULE
+      && seekingValue) {
+      // forward slash within a property after space, e.g. a{background:url(image.png) 0 0 /<--
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        character,
+        [[position.line, position.column, position.source]]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.COMMA && level == Level.RULE && seekingValue && !isBufferEmpty) {
+      // comma within a property, e.g. a{background:url(image.png),<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        character,
+        [[position.line, position.column, position.source]]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.COMMA && level == Level.RULE && seekingValue) {
+      // comma within a property after space, e.g. a{background:url(image.png) ,<--
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        character,
+        [[position.line, position.column, position.source]]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (character == Marker.CLOSE_SQUARE_BRACKET
+      && propertyToken
+      && propertyToken.length > 1
+      && !isBufferEmpty
+      && isRepeatToken(buffer)) {
+      buffer.push(character);
+      serializedBuffer = buffer.join('').trim();
+      propertyToken[propertyToken.length - 1][1] += serializedBuffer;
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if ((isSpace || (isNewLineNix && !isNewLineWin))
+      && level == Level.RULE
+      && seekingValue
+      && propertyToken
+      && !isBufferEmpty) {
+      // space or *nix newline within property, e.g. a{margin:0 <--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (isNewLineWin && level == Level.RULE && seekingValue && propertyToken && buffer.length > 1) {
+      // win newline within property, e.g. a{margin:0\r\n<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([
+        Token.PROPERTY_VALUE,
+        serializedBuffer,
+        [originalMetadata(metadata, serializedBuffer, externalContext)]
+      ]);
+
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (isNewLineWin && level == Level.RULE && seekingValue) {
+      // win newline
+      buffer = [];
+      isBufferEmpty = true;
+    } else if (isNewLineWin && buffer.length == 1) {
+      // ignore windows newline which is composed of two characters
+      buffer.pop();
+      isBufferEmpty = buffer.length === 0;
+    } else if (!isBufferEmpty || !isSpace && !isNewLineNix && !isNewLineWin && !isCarriageReturn) {
+      // any character
+      buffer.push(character);
+      isBufferEmpty = false;
+    }
+
+    wasEscaped = isEscaped;
+    isEscaped = !wasEscaped && character == Marker.BACK_SLASH;
+    wasCommentStart = isCommentStart;
+    wasCommentEnd = isCommentEnd;
+
+    position.line = (isNewLineWin || isNewLineNix || isCarriageReturn) ? position.line + 1 : position.line;
+    position.column = (isNewLineWin || isNewLineNix || isCarriageReturn) ? 0 : position.column + 1;
+  }
+
+  if (seekingValue) {
+    externalContext.warnings.push('Missing \'}\' at ' + formatPosition([position.line, position.column, position.source]) + '.');
+  }
+
+  if (seekingValue && buffer.length > 0) {
+    serializedBuffer = buffer.join('').trimRight().replace(TAIL_BROKEN_VALUE_PATTERN, '$1').trimRight();
+    propertyToken.push([
+      Token.PROPERTY_VALUE,
+      serializedBuffer,
+      [originalMetadata(metadata, serializedBuffer, externalContext)]
+    ]);
+
+    buffer = [];
+  }
+
+  if (buffer.length > 0) {
+    externalContext.warnings.push('Invalid character(s) \'' + buffer.join('') + '\' at ' + formatPosition(metadata) + '. Ignoring.');
+  }
+
+  return allTokens;
+}
+
+function isIgnoreStartComment(buffer) {
+  return IGNORE_START_COMMENT_PATTERN.test(buffer.join('') + Marker.FORWARD_SLASH);
+}
+
+function isIgnoreEndComment(buffer) {
+  return IGNORE_END_COMMENT_PATTERN.test(buffer.join('') + Marker.FORWARD_SLASH);
+}
+
+function originalMetadata(metadata, value, externalContext, selectorFallbacks) {
+  var source = metadata[2];
+
+  return externalContext.inputSourceMapTracker.isTracking(source)
+    ? externalContext.inputSourceMapTracker.originalPositionFor(metadata, value.length, selectorFallbacks)
+    : metadata;
+}
+
+function tokenTypeFrom(buffer) {
+  var isAtRule = buffer[0] == Marker.AT || buffer[0] == Marker.UNDERSCORE;
+  var ruleWord = buffer.join('').split(RULE_WORD_SEPARATOR_PATTERN)[0];
+
+  if (isAtRule && BLOCK_RULES.indexOf(ruleWord) > -1) {
+    return Token.NESTED_BLOCK;
+  } if (isAtRule && AT_RULES.indexOf(ruleWord) > -1) {
+    return Token.AT_RULE;
+  } if (isAtRule) {
+    return Token.AT_RULE_BLOCK;
+  }
+  return Token.RULE;
+}
+
+function tokenScopeFrom(tokenType) {
+  if (tokenType == Token.RULE) {
+    return Token.RULE_SCOPE;
+  } if (tokenType == Token.NESTED_BLOCK) {
+    return Token.NESTED_BLOCK_SCOPE;
+  } if (tokenType == Token.AT_RULE_BLOCK) {
+    return Token.AT_RULE_BLOCK_SCOPE;
+  }
+}
+
+function isPageMarginBox(buffer) {
+  var serializedBuffer = buffer.join('').trim();
+
+  return PAGE_MARGIN_BOXES.indexOf(serializedBuffer) > -1 || EXTRA_PAGE_BOXES.indexOf(serializedBuffer) > -1;
+}
+
+function isRepeatToken(buffer) {
+  return REPEAT_PATTERN.test(buffer.join('') + Marker.CLOSE_SQUARE_BRACKET);
+}
+
+module.exports = tokenize;
Index: imaps-frontend/node_modules/clean-css/lib/utils/clone-array.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/clone-array.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/clone-array.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,11 @@
+function cloneArray(array) {
+  var cloned = array.slice(0);
+
+  for (var i = 0, l = cloned.length; i < l; i++) {
+    if (Array.isArray(cloned[i])) { cloned[i] = cloneArray(cloned[i]); }
+  }
+
+  return cloned;
+}
+
+module.exports = cloneArray;
Index: imaps-frontend/node_modules/clean-css/lib/utils/format-position.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/format-position.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/format-position.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,11 @@
+function formatPosition(metadata) {
+  var line = metadata[0];
+  var column = metadata[1];
+  var source = metadata[2];
+
+  return source
+    ? source + ':' + line + ':' + column
+    : line + ':' + column;
+}
+
+module.exports = formatPosition;
Index: imaps-frontend/node_modules/clean-css/lib/utils/has-protocol.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/has-protocol.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/has-protocol.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var NO_PROTOCOL_RESOURCE_PATTERN = /^\/\//;
+
+function hasProtocol(uri) {
+  return !NO_PROTOCOL_RESOURCE_PATTERN.test(uri);
+}
+
+module.exports = hasProtocol;
Index: imaps-frontend/node_modules/clean-css/lib/utils/is-data-uri-resource.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/is-data-uri-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/is-data-uri-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var DATA_URI_PATTERN = /^data:(\S{0,31}?)?(;charset=(?:(?!;charset=)[^;])+)?(;[^,]+?)?,(.+)/;
+
+function isDataUriResource(uri) {
+  return DATA_URI_PATTERN.test(uri);
+}
+
+module.exports = isDataUriResource;
Index: imaps-frontend/node_modules/clean-css/lib/utils/is-http-resource.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/is-http-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/is-http-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var HTTP_RESOURCE_PATTERN = /^http:\/\//;
+
+function isHttpResource(uri) {
+  return HTTP_RESOURCE_PATTERN.test(uri);
+}
+
+module.exports = isHttpResource;
Index: imaps-frontend/node_modules/clean-css/lib/utils/is-https-resource.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/is-https-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/is-https-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var HTTPS_RESOURCE_PATTERN = /^https:\/\//;
+
+function isHttpsResource(uri) {
+  return HTTPS_RESOURCE_PATTERN.test(uri);
+}
+
+module.exports = isHttpsResource;
Index: imaps-frontend/node_modules/clean-css/lib/utils/is-import.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/is-import.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/is-import.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,7 @@
+var IMPORT_PREFIX_PATTERN = /^@import/i;
+
+function isImport(value) {
+  return IMPORT_PREFIX_PATTERN.test(value);
+}
+
+module.exports = isImport;
Index: imaps-frontend/node_modules/clean-css/lib/utils/is-remote-resource.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/is-remote-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/is-remote-resource.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,8 @@
+var REMOTE_RESOURCE_PATTERN = /^(\w+:\/\/|\/\/)/;
+var FILE_RESOURCE_PATTERN = /^file:\/\//;
+
+function isRemoteResource(uri) {
+  return REMOTE_RESOURCE_PATTERN.test(uri) && !FILE_RESOURCE_PATTERN.test(uri);
+}
+
+module.exports = isRemoteResource;
Index: imaps-frontend/node_modules/clean-css/lib/utils/natural-compare.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/natural-compare.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/natural-compare.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,31 @@
+// adapted from http://nedbatchelder.com/blog/200712.html#e20071211T054956
+
+var NUMBER_PATTERN = /([0-9]+)/;
+
+function naturalCompare(value1, value2) {
+  var keys1 = ('' + value1).split(NUMBER_PATTERN).map(tryParseInt);
+  var keys2 = ('' + value2).split(NUMBER_PATTERN).map(tryParseInt);
+  var key1;
+  var key2;
+  var compareFirst = Math.min(keys1.length, keys2.length);
+  var i, l;
+
+  for (i = 0, l = compareFirst; i < l; i++) {
+    key1 = keys1[i];
+    key2 = keys2[i];
+
+    if (key1 != key2) {
+      return key1 > key2 ? 1 : -1;
+    }
+  }
+
+  return keys1.length > keys2.length ? 1 : (keys1.length == keys2.length ? 0 : -1);
+}
+
+function tryParseInt(value) {
+  return ('' + parseInt(value)) == value
+    ? parseInt(value)
+    : value;
+}
+
+module.exports = naturalCompare;
Index: imaps-frontend/node_modules/clean-css/lib/utils/override.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/override.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/override.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,34 @@
+function override(source1, source2) {
+  var target = {};
+  var key1;
+  var key2;
+  var item;
+
+  for (key1 in source1) {
+    item = source1[key1];
+
+    if (Array.isArray(item)) {
+      target[key1] = item.slice(0);
+    } else if (typeof item == 'object' && item !== null) {
+      target[key1] = override(item, {});
+    } else {
+      target[key1] = item;
+    }
+  }
+
+  for (key2 in source2) {
+    item = source2[key2];
+
+    if (key2 in target && Array.isArray(item)) {
+      target[key2] = item.slice(0);
+    } else if (key2 in target && typeof item == 'object' && item !== null) {
+      target[key2] = override(target[key2], item);
+    } else {
+      target[key2] = item;
+    }
+  }
+
+  return target;
+}
+
+module.exports = override;
Index: imaps-frontend/node_modules/clean-css/lib/utils/split.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/utils/split.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/utils/split.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,62 @@
+var Marker = require('../tokenizer/marker');
+
+function is(value, separator, isSeparatorRegex) {
+  return isSeparatorRegex
+    ? separator.test(value)
+    : value === separator;
+}
+
+function split(value, separator) {
+  var openLevel = Marker.OPEN_ROUND_BRACKET;
+  var closeLevel = Marker.CLOSE_ROUND_BRACKET;
+  var level = 0;
+  var cursor = 0;
+  var lastStart = 0;
+  var lastValue;
+  var lastCharacter;
+  var len = value.length;
+  var parts = [];
+  var isSeparatorRegex = typeof (separator) == 'object' && 'exec' in separator;
+
+  if (!isSeparatorRegex && value.indexOf(separator) == -1) {
+    return [value];
+  }
+
+  if (value.indexOf(openLevel) == -1) {
+    return value.split(separator);
+  }
+
+  while (cursor < len) {
+    if (value[cursor] == openLevel) {
+      level++;
+    } else if (value[cursor] == closeLevel) {
+      level--;
+    }
+
+    if (level === 0 && cursor > 0 && cursor + 1 < len && is(value[cursor], separator, isSeparatorRegex)) {
+      parts.push(value.substring(lastStart, cursor));
+
+      if (isSeparatorRegex && separator.exec(value[cursor]).length > 1) {
+        parts.push(value[cursor]);
+      }
+
+      lastStart = cursor + 1;
+    }
+
+    cursor++;
+  }
+
+  if (lastStart < cursor + 1) {
+    lastValue = value.substring(lastStart);
+    lastCharacter = lastValue[lastValue.length - 1];
+    if (is(lastCharacter, separator, isSeparatorRegex)) {
+      lastValue = lastValue.substring(0, lastValue.length - 1);
+    }
+
+    parts.push(lastValue);
+  }
+
+  return parts;
+}
+
+module.exports = split;
Index: imaps-frontend/node_modules/clean-css/lib/writer/helpers.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/writer/helpers.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/writer/helpers.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,256 @@
+var emptyCharacter = '';
+
+var Breaks = require('../options/format').Breaks;
+var Spaces = require('../options/format').Spaces;
+
+var Marker = require('../tokenizer/marker');
+var Token = require('../tokenizer/token');
+
+function supportsAfterClosingBrace(token) {
+  return token[1][1] == 'background' || token[1][1] == 'transform' || token[1][1] == 'src';
+}
+
+function afterClosingBrace(token, valueIndex) {
+  return token[valueIndex][1][token[valueIndex][1].length - 1] == Marker.CLOSE_ROUND_BRACKET;
+}
+
+function afterComma(token, valueIndex) {
+  return token[valueIndex][1] == Marker.COMMA;
+}
+
+function afterSlash(token, valueIndex) {
+  return token[valueIndex][1] == Marker.FORWARD_SLASH;
+}
+
+function beforeComma(token, valueIndex) {
+  return token[valueIndex + 1] && token[valueIndex + 1][1] == Marker.COMMA;
+}
+
+function beforeSlash(token, valueIndex) {
+  return token[valueIndex + 1] && token[valueIndex + 1][1] == Marker.FORWARD_SLASH;
+}
+
+function inFilter(token) {
+  return token[1][1] == 'filter' || token[1][1] == '-ms-filter';
+}
+
+function disallowsSpace(context, token, valueIndex) {
+  return !context.spaceAfterClosingBrace
+    && supportsAfterClosingBrace(token)
+    && afterClosingBrace(token, valueIndex)
+    || beforeSlash(token, valueIndex)
+    || afterSlash(token, valueIndex)
+    || beforeComma(token, valueIndex)
+    || afterComma(token, valueIndex);
+}
+
+function rules(context, tokens) {
+  var store = context.store;
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    store(context, tokens[i]);
+
+    if (i < l - 1) {
+      store(context, comma(context));
+    }
+  }
+}
+
+function body(context, tokens) {
+  var lastPropertyAt = lastPropertyIndex(tokens);
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    property(context, tokens, i, lastPropertyAt);
+  }
+}
+
+function lastPropertyIndex(tokens) {
+  var index = tokens.length - 1;
+
+  for (; index >= 0; index--) {
+    if (tokens[index][0] != Token.COMMENT) {
+      break;
+    }
+  }
+
+  return index;
+}
+
+function property(context, tokens, position, lastPropertyAt) {
+  var store = context.store;
+  var token = tokens[position];
+
+  var propertyValue = token[2];
+  var isPropertyBlock = propertyValue && propertyValue[0] === Token.PROPERTY_BLOCK;
+
+  var needsSemicolon;
+  if (context.format) {
+    if (context.format.semicolonAfterLastProperty || isPropertyBlock) {
+      needsSemicolon = true;
+    } else if (position < lastPropertyAt) {
+      needsSemicolon = true;
+    } else {
+      needsSemicolon = false;
+    }
+  } else {
+    needsSemicolon = position < lastPropertyAt || isPropertyBlock;
+  }
+
+  var isLast = position === lastPropertyAt;
+
+  switch (token[0]) {
+  case Token.AT_RULE:
+    store(context, token);
+    store(context, semicolon(context, Breaks.AfterProperty, false));
+    break;
+  case Token.AT_RULE_BLOCK:
+    rules(context, token[1]);
+    store(context, openBrace(context, Breaks.AfterRuleBegins, true));
+    body(context, token[2]);
+    store(context, closeBrace(context, Breaks.AfterRuleEnds, false, isLast));
+    break;
+  case Token.COMMENT:
+    store(context, token);
+    store(context, breakFor(context, Breaks.AfterComment) + context.indentWith);
+    break;
+  case Token.PROPERTY:
+    store(context, token[1]);
+    store(context, colon(context));
+    if (propertyValue) {
+      value(context, token);
+    }
+    store(
+      context,
+      needsSemicolon ? semicolon(context, Breaks.AfterProperty, isLast) : emptyCharacter
+    );
+    break;
+  case Token.RAW:
+    store(context, token);
+  }
+}
+
+function value(context, token) {
+  var store = context.store;
+  var j, m;
+
+  if (token[2][0] == Token.PROPERTY_BLOCK) {
+    store(context, openBrace(context, Breaks.AfterBlockBegins, false));
+    body(context, token[2][1]);
+    store(context, closeBrace(context, Breaks.AfterBlockEnds, false, true));
+  } else {
+    for (j = 2, m = token.length; j < m; j++) {
+      store(context, token[j]);
+
+      if (j < m - 1 && (inFilter(token) || !disallowsSpace(context, token, j))) {
+        store(context, Marker.SPACE);
+      }
+    }
+  }
+}
+
+function breakFor(context, where) {
+  return context.format ? context.format.breaks[where] : emptyCharacter;
+}
+
+function allowsSpace(context, where) {
+  return context.format && context.format.spaces[where];
+}
+
+function openBrace(context, where, needsPrefixSpace) {
+  if (context.format) {
+    context.indentBy += context.format.indentBy;
+    context.indentWith = context.format.indentWith.repeat(context.indentBy);
+    return (
+      needsPrefixSpace
+      && allowsSpace(context, Spaces.BeforeBlockBegins) ? Marker.SPACE : emptyCharacter
+    ) + Marker.OPEN_CURLY_BRACKET
+      + breakFor(context, where)
+      + context.indentWith;
+  }
+  return Marker.OPEN_CURLY_BRACKET;
+}
+
+function closeBrace(context, where, beforeBlockEnd, isLast) {
+  if (context.format) {
+    context.indentBy -= context.format.indentBy;
+    context.indentWith = context.format.indentWith.repeat(context.indentBy);
+    return (
+      beforeBlockEnd
+        ? breakFor(context, Breaks.BeforeBlockEnds)
+        : breakFor(context, Breaks.AfterProperty)
+    ) + context.indentWith
+      + Marker.CLOSE_CURLY_BRACKET
+      + (isLast ? emptyCharacter : breakFor(context, where) + context.indentWith);
+  }
+  return Marker.CLOSE_CURLY_BRACKET;
+}
+
+function colon(context) {
+  return context.format
+    ? Marker.COLON + (allowsSpace(context, Spaces.BeforeValue) ? Marker.SPACE : emptyCharacter)
+    : Marker.COLON;
+}
+
+function semicolon(context, where, isLast) {
+  return context.format
+    ? Marker.SEMICOLON + (isLast ? emptyCharacter : (breakFor(context, where) + context.indentWith))
+    : Marker.SEMICOLON;
+}
+
+function comma(context) {
+  return context.format
+    ? Marker.COMMA + breakFor(context, Breaks.BetweenSelectors) + context.indentWith
+    : Marker.COMMA;
+}
+
+function all(context, tokens) {
+  var store = context.store;
+  var token;
+  var isLast;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+    isLast = i == l - 1;
+
+    switch (token[0]) {
+    case Token.AT_RULE:
+      store(context, token);
+      store(context, semicolon(context, Breaks.AfterAtRule, isLast));
+      break;
+    case Token.AT_RULE_BLOCK:
+      rules(context, token[1]);
+      store(context, openBrace(context, Breaks.AfterRuleBegins, true));
+      body(context, token[2]);
+      store(context, closeBrace(context, Breaks.AfterRuleEnds, false, isLast));
+      break;
+    case Token.NESTED_BLOCK:
+      rules(context, token[1]);
+      store(context, openBrace(context, Breaks.AfterBlockBegins, true));
+      all(context, token[2]);
+      store(context, closeBrace(context, Breaks.AfterBlockEnds, true, isLast));
+      break;
+    case Token.COMMENT:
+      store(context, token);
+      store(context, breakFor(context, Breaks.AfterComment) + context.indentWith);
+      break;
+    case Token.RAW:
+      store(context, token);
+      break;
+    case Token.RULE:
+      rules(context, token[1]);
+      store(context, openBrace(context, Breaks.AfterRuleBegins, true));
+      body(context, token[2]);
+      store(context, closeBrace(context, Breaks.AfterRuleEnds, false, isLast));
+      break;
+    }
+  }
+}
+
+module.exports = {
+  all: all,
+  body: body,
+  property: property,
+  rules: rules,
+  value: value
+};
Index: imaps-frontend/node_modules/clean-css/lib/writer/one-time.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/writer/one-time.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/writer/one-time.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,52 @@
+var helpers = require('./helpers');
+
+function store(serializeContext, token) {
+  serializeContext.output.push(typeof token == 'string' ? token : token[1]);
+}
+
+function context() {
+  var newContext = {
+    output: [],
+    store: store
+  };
+
+  return newContext;
+}
+
+function all(tokens) {
+  var oneTimeContext = context();
+  helpers.all(oneTimeContext, tokens);
+  return oneTimeContext.output.join('');
+}
+
+function body(tokens) {
+  var oneTimeContext = context();
+  helpers.body(oneTimeContext, tokens);
+  return oneTimeContext.output.join('');
+}
+
+function property(tokens, position) {
+  var oneTimeContext = context();
+  helpers.property(oneTimeContext, tokens, position, true);
+  return oneTimeContext.output.join('');
+}
+
+function rules(tokens) {
+  var oneTimeContext = context();
+  helpers.rules(oneTimeContext, tokens);
+  return oneTimeContext.output.join('');
+}
+
+function value(tokens) {
+  var oneTimeContext = context();
+  helpers.value(oneTimeContext, tokens);
+  return oneTimeContext.output.join('');
+}
+
+module.exports = {
+  all: all,
+  body: body,
+  property: property,
+  rules: rules,
+  value: value
+};
Index: imaps-frontend/node_modules/clean-css/lib/writer/simple.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/writer/simple.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/writer/simple.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,48 @@
+var all = require('./helpers').all;
+
+function store(serializeContext, token) {
+  var value = typeof token == 'string'
+    ? token
+    : token[1];
+  var wrap = serializeContext.wrap;
+
+  wrap(serializeContext, value);
+  track(serializeContext, value);
+  serializeContext.output.push(value);
+}
+
+function wrap(serializeContext, value) {
+  if (serializeContext.column + value.length > serializeContext.format.wrapAt) {
+    track(serializeContext, serializeContext.format.breakWith);
+    serializeContext.output.push(serializeContext.format.breakWith);
+  }
+}
+
+function track(serializeContext, value) {
+  var parts = value.split('\n');
+
+  serializeContext.line += parts.length - 1;
+  serializeContext.column = parts.length > 1 ? 0 : (serializeContext.column + parts.pop().length);
+}
+
+function serializeStyles(tokens, context) {
+  var serializeContext = {
+    column: 0,
+    format: context.options.format,
+    indentBy: 0,
+    indentWith: '',
+    line: 1,
+    output: [],
+    spaceAfterClosingBrace: context.options.compatibility.properties.spaceAfterClosingBrace,
+    store: store,
+    wrap: context.options.format.wrapAt
+      ? wrap
+      : function() { /* noop */ }
+  };
+
+  all(serializeContext, tokens);
+
+  return { styles: serializeContext.output.join('') };
+}
+
+module.exports = serializeStyles;
Index: imaps-frontend/node_modules/clean-css/lib/writer/source-maps.js
===================================================================
--- imaps-frontend/node_modules/clean-css/lib/writer/source-maps.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/lib/writer/source-maps.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,104 @@
+var SourceMapGenerator = require('source-map').SourceMapGenerator;
+var all = require('./helpers').all;
+
+var isRemoteResource = require('../utils/is-remote-resource');
+
+var isWindows = process.platform == 'win32';
+
+var NIX_SEPARATOR_PATTERN = /\//g;
+var UNKNOWN_SOURCE = '$stdin';
+var WINDOWS_SEPARATOR = '\\';
+
+function store(serializeContext, element) {
+  var fromString = typeof element == 'string';
+  var value = fromString ? element : element[1];
+  var mappings = fromString ? null : element[2];
+  var wrap = serializeContext.wrap;
+
+  wrap(serializeContext, value);
+  track(serializeContext, value, mappings);
+  serializeContext.output.push(value);
+}
+
+function wrap(serializeContext, value) {
+  if (serializeContext.column + value.length > serializeContext.format.wrapAt) {
+    track(serializeContext, serializeContext.format.breakWith, false);
+    serializeContext.output.push(serializeContext.format.breakWith);
+  }
+}
+
+function track(serializeContext, value, mappings) {
+  var parts = value.split('\n');
+
+  if (mappings) {
+    trackAllMappings(serializeContext, mappings);
+  }
+
+  serializeContext.line += parts.length - 1;
+  serializeContext.column = parts.length > 1 ? 0 : (serializeContext.column + parts.pop().length);
+}
+
+function trackAllMappings(serializeContext, mappings) {
+  for (var i = 0, l = mappings.length; i < l; i++) {
+    trackMapping(serializeContext, mappings[i]);
+  }
+}
+
+function trackMapping(serializeContext, mapping) {
+  var line = mapping[0];
+  var column = mapping[1];
+  var originalSource = mapping[2];
+  var source = originalSource;
+  var storedSource = source || UNKNOWN_SOURCE;
+
+  if (isWindows && source && !isRemoteResource(source)) {
+    storedSource = source.replace(NIX_SEPARATOR_PATTERN, WINDOWS_SEPARATOR);
+  }
+
+  serializeContext.outputMap.addMapping({
+    generated: {
+      line: serializeContext.line,
+      column: serializeContext.column
+    },
+    source: storedSource,
+    original: {
+      line: line,
+      column: column
+    }
+  });
+
+  if (serializeContext.inlineSources && (originalSource in serializeContext.sourcesContent)) {
+    serializeContext.outputMap.setSourceContent(
+      storedSource,
+      serializeContext.sourcesContent[originalSource]
+    );
+  }
+}
+
+function serializeStylesAndSourceMap(tokens, context) {
+  var serializeContext = {
+    column: 0,
+    format: context.options.format,
+    indentBy: 0,
+    indentWith: '',
+    inlineSources: context.options.sourceMapInlineSources,
+    line: 1,
+    output: [],
+    outputMap: new SourceMapGenerator(),
+    sourcesContent: context.sourcesContent,
+    spaceAfterClosingBrace: context.options.compatibility.properties.spaceAfterClosingBrace,
+    store: store,
+    wrap: context.options.format.wrapAt
+      ? wrap
+      : function() { /* noop */ }
+  };
+
+  all(serializeContext, tokens);
+
+  return {
+    sourceMap: serializeContext.outputMap,
+    styles: serializeContext.output.join('')
+  };
+}
+
+module.exports = serializeStylesAndSourceMap;
Index: imaps-frontend/node_modules/clean-css/package.json
===================================================================
--- imaps-frontend/node_modules/clean-css/package.json	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/clean-css/package.json	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,48 @@
+{
+  "name": "clean-css",
+  "version": "5.3.3",
+  "author": "Jakub Pawlowicz <contact@jakubpawlowicz.com>",
+  "description": "A well-tested CSS minifier",
+  "license": "MIT",
+  "keywords": [
+    "css",
+    "minifier"
+  ],
+  "homepage": "https://github.com/clean-css/clean-css",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/clean-css/clean-css.git"
+  },
+  "bugs": {
+    "url": "https://github.com/clean-css/clean-css/issues"
+  },
+  "main": "index.js",
+  "files": [
+    "lib",
+    "History.md",
+    "index.js",
+    "LICENSE"
+  ],
+  "scripts": {
+    "browserify": "browserify --standalone CleanCSS index.js | uglifyjs --compress --mangle -o cleancss-browser.js",
+    "bench": "node ./test/bench.js",
+    "lint": "eslint ./lib/ --ext .js",
+    "test": "vows"
+  },
+  "dependencies": {
+    "source-map": "~0.6.0"
+  },
+  "devDependencies": {
+    "browserify": "^17.0.0",
+    "eslint": "^8.8.0",
+    "eslint-config-airbnb-base": "^15.0.0",
+    "http-proxy": "1.x",
+    "nock": "^13.0.0",
+    "server-destroy": "1.x",
+    "uglify-js": ">=2.6.1",
+    "vows": "0.8.x"
+  },
+  "engines": {
+    "node": ">= 10.0"
+  }
+}
