Index: frontend/node_modules/mdn-data/README.md
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+# MDN data
+
+[https://github.com/mdn/data](https://github.com/mdn/data)
+
+Maintained by the [MDN team at Mozilla](https://wiki.mozilla.org/MDN).
+
+This repository contains general data for Web technologies.
+
+This data is used in MDN documentation, to build
+[information boxes](https://developer.mozilla.org/en-US/docs/Web/CSS/background)
+or [sidebar navigation](https://developer.mozilla.org/en-US/docs/Web/API/Window).
+External tools have started to make use of this data as well.
+For example, the [CSSTree](https://github.com/csstree/csstree/) CSS parser.
+
+
+[![NPM version](https://img.shields.io/npm/v/mdn-data.svg)](https://www.npmjs.com/package/mdn-data)
+[![Build Status](https://travis-ci.org/mdn/data.svg?branch=master)](https://travis-ci.org/mdn/data)
+
+## Repository contents
+
+There's a top-level directory for each broad area covered: for example, "api",
+"css", "svg". Inside each of these directories is one or more
+JSON files containing the data.
+
+### api
+Contains data about Web APIs:
+* API inheritance (interface inheritance and mixin implementations)
+
+### css
+ Contains data about:
+* CSS at-rules
+* CSS properties
+* CSS selectors
+* CSS syntaxes
+* CSS types
+* CSS units
+
+Read more about [CSS data](https://github.com/mdn/data/blob/master/css/readme.md) and the format of the files.
+
+
+### l10n
+The l10n folder contains localization strings that are used in the various
+json files throughout this repository.
+
+## Problems?
+
+If you find a problem, please [file an issue](https://github.com/mdn/data/issues/new).
+
+## Contributing
+
+We're very happy to accept contributions to this data. Please familiarize yourself
+with the schema for the data you're editing, and send us a pull request. See also the [Contributing file](https://github.com/mdn/data/blob/master/CONTRIBUTING.md) for more information.
+
+## See also
+* [https://github.com/mdn/browser-compat-data](https://github.com/mdn/browser-compat-data)
+for compatibility data for Web technologies.