2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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# PostCSS Discard Overridden [![Build Status][ci-img]][ci]
[PostCSS] plugin to discard overridden `@keyframes` or `@counter-style`.
`@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**.
[PostCSS]: https://github.com/postcss/postcss
[ci-img]: https://travis-ci.org/Justineo/postcss-discard-overridden.svg
[ci]: https://travis-ci.org/Justineo/postcss-discard-overridden
```css
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@media (max-width: 500px) {
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@supports (display: flex) {
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
}
}
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
```
```css
@media (max-width: 500px) {
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@supports (display: flex) {
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
}
}
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
```
## Usage
```js
postcss([ require('postcss-discard-overridden') ])
```
See [PostCSS] docs for examples for your environment.
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