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159 lines
2.5 KiB
159 lines
2.5 KiB
2 years ago
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# PostCSS Discard Overridden
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[PostCSS] plugin to discard overridden `@keyframes` or `@counter-style`.
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`@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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[PostCSS]: https://github.com/postcss/postcss
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```css
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@-webkit-keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 0.8;
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}
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}
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@keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 0.8;
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}
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}
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@media (max-width: 500px) {
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@-webkit-keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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@keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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@-webkit-keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 0.8;
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}
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}
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@keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 0.8;
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}
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}
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@supports (display: flex) {
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@-webkit-keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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@keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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}
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}
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@-webkit-keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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@keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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```
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```css
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@media (max-width: 500px) {
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@-webkit-keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 0.8;
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}
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}
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@keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 0.8;
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}
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}
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@supports (display: flex) {
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@-webkit-keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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@keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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}
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}
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@-webkit-keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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@keyframes fade-in {
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0% {
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opacity: 0;
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}
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100% {
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opacity: 1;
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}
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}
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```
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## Usage
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See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
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examples for your environment.
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## Contributors
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See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).
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