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-# PostCSS Is Pseudo [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS" width="90" height="90" align="right">][postcss]
-
-[![NPM Version][npm-img]][npm-url]
-[<img alt="Build Status" src="https://github.com/csstools/postcss-plugins/workflows/test/badge.svg" height="20">][cli-url]
-[<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord]
-<br><br>
-[<img alt="Baseline Status" src="https://cssdb.org/images/badges-baseline/is-pseudo-class.svg" height="20">][css-url]
-[![CSS Standard Status][css-img]][css-url]
-
-[PostCSS Is Pseudo Class] lets you use the `:is` pseudo class function, following the
-[CSS Selector] specification.
-
-```pcss
-:is(input, button):is(:hover, :focus) {
-	order: 1;
-}
-```
-
-Becomes :
-
-```pcss
-input:hover {
-	order: 1;
-}
-input:focus {
-	order: 1;
-}
-button:hover {
-	order: 1;
-}
-button:focus {
-	order: 1;
-}
-```
-
-## Usage
-
-Add [PostCSS Is Pseudo Class] to your project:
-
-```bash
-npm install @csstools/postcss-is-pseudo-class --save-dev
-```
-
-Use [PostCSS Is Pseudo Class] as a [PostCSS] plugin:
-
-```js
-import postcss from 'postcss';
-import postcssIsPseudoClass from '@csstools/postcss-is-pseudo-class';
-
-postcss([
-  postcssIsPseudoClass(/* pluginOptions */)
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-[PostCSS Is Pseudo Class] runs in all Node environments, with special instructions for:
-
-| [Node](INSTALL.md#node) | [Webpack](INSTALL.md#webpack) | [Gulp](INSTALL.md#gulp) | [Grunt](INSTALL.md#grunt) |
-| --- | --- | --- | --- |
-
-## Options
-
-### preserve
-
-The `preserve` option determines whether the original notation
-is preserved. By default, it is not preserved.
-
-```js
-postcss([
-  postcssIsPseudoClass({ preserve: true })
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-```pcss
-:is(input, button):is(:hover, :focus) {
-	order: 1;
-}
-```
-
-Becomes :
-
-```pcss
-input:hover {
-	order: 1;
-}
-input:focus {
-	order: 1;
-}
-button:hover {
-	order: 1;
-}
-button:focus {
-	order: 1;
-}
-:is(input, button):is(:hover, :focus) {
-	order: 1;
-}
-```
-
-### specificityMatchingName
-
-The `specificityMatchingName` option allows you to change the selector used to adjust specificity.
-The default value is `does-not-exist`.
-If this is an actual class, id or tag name in your code, you will need to set a different option here.
-
-See how `:not` is used to modify [specificity](#specificity).
-
-```js
-postcss([
-  postcssIsPseudoClass({ specificityMatchingName: 'something-random' })
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-```pcss
-:is(.button, button):hover {
-	order: 7;
-}
-```
-
-Becomes :
-
-```pcss
-.button:hover {
-	order: 7;
-}
-
-button:not(.something-random):hover {
-	order: 7;
-}
-```
-
-### onComplexSelector
-
-Warn on complex selectors in `:is` pseudo class functions.
-
-```js
-postcss([
-  postcssIsPseudoClass({ onComplexSelector: 'warning' })
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-### onPseudoElement
-
-Warn when pseudo elements are used in `:is` pseudo class functions.
-
-⚠️ Pseudo elements are always invalid and will be transformed to `::-csstools-invalid-<pseudo-name>`.
-
-```js
-postcss([
-  postcssIsPseudoClass({ onPseudoElement: 'warning' })
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-```css
-:is(::after):hover {
-	order: 1.0;
-}
-
-/* becomes */
-
-::-csstools-invalid-after:hover {
-	order: 1.0;
-}
-```
-
-## ⚠️ Known shortcomings
-
-### Specificity
-
-`:is` takes the specificity of the most specific list item.
-We can increase specificity with `:not` selectors, but we can't decrease it.
-
-Converted selectors are ensured to have the same specificity as `:is` for the most important bit.
-Less important bits can have higher specificity that `:is`.
-
-Before :
-
-[specificity: 0, 2, 0](https://polypane.app/css-specificity-calculator/#selector=%3Ais(%3Ahover%2C%20%3Afocus)%3Ais(.button%2C%20button))
-
-```pcss
-:is(:hover, :focus):is(.button, button) {
-	order: 7;
-}
-```
-
-After :
-
-```pcss
-/* specificity: [0, 2, 0] */
-.button:hover {
-	order: 7;
-}
-
-/* specificity: [0, 2, 1] */
-/* last bit is higher than it should be, but middle bit matches */
-button:not(.does-not-exist):hover {
-	order: 7;
-}
-
-/* specificity: [0, 2, 0] */
-.button:focus {
-	order: 7;
-}
-
-/* specificity: [0, 2, 1] */
-/* last bit is higher than it should be, but middle bit matches */
-button:not(.does-not-exist):focus {
-	order: 7;
-}
-```
-
-### Complex selectors
-
-Before :
-
-
-```pcss
-:is(.alpha > .beta) ~ :is(:focus > .beta) {
-	order: 2;
-}
-```
-
-After :
-
-```pcss
-.alpha > .beta ~ :focus > .beta {
-	order: 2;
-}
-```
-
-_this is a different selector than expected as `.beta ~ :focus` matches `.beta` followed by `:focus`._<br>
-_avoid these cases._<br>
-_writing the selector without `:is()` is advised here_
-
-```pcss
-/* without is */
-.alpha:focus > .beta ~ .beta {
-	order: 2;
-}
-```
-
-If you have a specific pattern you can open an issue to discuss it.
-We can detect and transform some cases but can't generalize them into a single solution that tackles all of them. 
-
-[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
-[css-img]: https://cssdb.org/images/badges/is-pseudo-class.svg
-[css-url]: https://cssdb.org/#is-pseudo-class
-[discord]: https://discord.gg/bUadyRwkJS
-[npm-img]: https://img.shields.io/npm/v/@csstools/postcss-is-pseudo-class.svg
-[npm-url]: https://www.npmjs.com/package/@csstools/postcss-is-pseudo-class
-
-[CSS Selector]: https://www.w3.org/TR/selectors-4/#matches
-[PostCSS]: https://github.com/postcss/postcss
-[PostCSS Is Pseudo Class]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-is-pseudo-class