| 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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