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1 | # PostCSS Discard Overridden
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2 |
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3 | [PostCSS] plugin to discard overridden `@keyframes` or `@counter-style`.
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4 |
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5 | `@keyframes` or `@counter-style` will be overridden by those who share the same identifiers and appear later in stylesheets. So we can discard all of them except the last one. When defined inside a `@media` or `@supports` rule, `@keyframes` and `@counter-style` rules only override global rules in some of the client browsers so they need handled separately. This plugin has taken care of this and transforms the PostCss AST **safely**.
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6 |
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7 | [PostCSS]: https://github.com/postcss/postcss
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8 |
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9 | ```css
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10 | @-webkit-keyframes fade-in {
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11 | 0% {
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12 | opacity: 0;
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13 | }
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14 | 100% {
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15 | opacity: 0.8;
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16 | }
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17 | }
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18 | @keyframes fade-in {
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19 | 0% {
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20 | opacity: 0;
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21 | }
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22 | 100% {
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23 | opacity: 0.8;
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24 | }
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25 | }
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26 | @media (max-width: 500px) {
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27 | @-webkit-keyframes fade-in {
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28 | 0% {
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29 | opacity: 0;
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30 | }
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31 | 100% {
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32 | opacity: 1;
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33 | }
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34 | }
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35 | @keyframes fade-in {
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36 | 0% {
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37 | opacity: 0;
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38 | }
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39 | 100% {
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40 | opacity: 1;
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41 | }
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42 | }
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43 | @-webkit-keyframes fade-in {
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44 | 0% {
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45 | opacity: 0;
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46 | }
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47 | 100% {
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48 | opacity: 0.8;
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49 | }
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50 | }
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51 | @keyframes fade-in {
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52 | 0% {
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53 | opacity: 0;
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54 | }
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55 | 100% {
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56 | opacity: 0.8;
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57 | }
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58 | }
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59 | @supports (display: flex) {
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60 | @-webkit-keyframes fade-in {
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61 | 0% {
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62 | opacity: 0;
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63 | }
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64 | 100% {
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65 | opacity: 1;
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66 | }
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67 | }
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68 | @keyframes fade-in {
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69 | 0% {
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70 | opacity: 0;
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71 | }
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72 | 100% {
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73 | opacity: 1;
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74 | }
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75 | }
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76 | }
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77 | }
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78 | @-webkit-keyframes fade-in {
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79 | 0% {
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80 | opacity: 0;
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81 | }
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82 | 100% {
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83 | opacity: 1;
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84 | }
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85 | }
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86 | @keyframes fade-in {
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87 | 0% {
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88 | opacity: 0;
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89 | }
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90 | 100% {
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91 | opacity: 1;
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92 | }
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93 | }
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94 | ```
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95 |
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96 | ```css
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97 | @media (max-width: 500px) {
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98 | @-webkit-keyframes fade-in {
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99 | 0% {
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100 | opacity: 0;
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101 | }
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102 | 100% {
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103 | opacity: 0.8;
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104 | }
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105 | }
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106 | @keyframes fade-in {
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107 | 0% {
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108 | opacity: 0;
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109 | }
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110 | 100% {
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111 | opacity: 0.8;
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112 | }
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113 | }
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114 | @supports (display: flex) {
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115 | @-webkit-keyframes fade-in {
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116 | 0% {
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117 | opacity: 0;
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118 | }
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119 | 100% {
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120 | opacity: 1;
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121 | }
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122 | }
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123 | @keyframes fade-in {
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124 | 0% {
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125 | opacity: 0;
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126 | }
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127 | 100% {
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128 | opacity: 1;
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129 | }
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130 | }
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131 | }
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132 | }
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133 | @-webkit-keyframes fade-in {
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134 | 0% {
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135 | opacity: 0;
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136 | }
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137 | 100% {
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138 | opacity: 1;
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139 | }
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140 | }
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141 | @keyframes fade-in {
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142 | 0% {
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143 | opacity: 0;
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144 | }
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145 | 100% {
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146 | opacity: 1;
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147 | }
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148 | }
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149 | ```
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150 |
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151 | ## Usage
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152 |
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153 | See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
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154 | examples for your environment.
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155 |
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156 | ## Contributors
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157 |
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158 | See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).
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