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authorlittleblack111 <littleblack11111@gmail.com>2026-05-18 23:10:59 +0800
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-# PostCSS Custom Selectors [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS Logo" width="90" height="90" align="right">][PostCSS]
-
-[<img alt="npm version" src="https://img.shields.io/npm/v/postcss-custom-selectors.svg" height="20">][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/custom-selectors.svg" height="20">][css-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/custom-selectors.svg" height="20">][css-url]
-
-```bash
-npm install postcss-custom-selectors --save-dev
-```
-
-[PostCSS Custom Selectors] lets you define `@custom-selector` in CSS following the [Custom Selectors Specification].
-
-```pcss
-@custom-selector :--heading h1, h2, h3;
-
-article :--heading + p {
- margin-top: 0;
-}
-
-/* becomes */
-
-article :is(h1, h2, h3) + p {
- margin-top: 0;
-}
-```
-
-## Usage
-
-Add [PostCSS Custom Selectors] to your project:
-
-```bash
-npm install postcss postcss-custom-selectors --save-dev
-```
-
-Use it as a [PostCSS] plugin:
-
-```js
-const postcss = require('postcss');
-const postcssCustomSelectors = require('postcss-custom-selectors');
-
-postcss([
- postcssCustomSelectors(/* pluginOptions */)
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-[PostCSS Custom Selectors] runs in all Node environments, with special
-instructions for:
-
-- [Node](INSTALL.md#node)
-- [PostCSS CLI](INSTALL.md#postcss-cli)
-- [PostCSS Load Config](INSTALL.md#postcss-load-config)
-- [Webpack](INSTALL.md#webpack)
-- [Next.js](INSTALL.md#nextjs)
-- [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
-postcssCustomSelectors({ preserve: true })
-```
-
-```pcss
-@custom-selector :--heading h1, h2, h3;
-
-article :--heading + p {
- margin-top: 0;
-}
-
-/* becomes */
-
-@custom-selector :--heading h1, h2, h3;
-
-article :is(h1, h2, h3) + p {
- margin-top: 0;
-}
-
-article :--heading + p {
- margin-top: 0;
-}
-```
-
-## Modular CSS Processing
-
-If you're using Modular CSS such as, CSS Modules, `postcss-loader` or `vanilla-extract` to name a few, you'll probably
-notice that custom selectors are not being resolved. This happens because each file is processed separately so
-unless you import the custom selector definitions in each file, they won't be resolved.
-
-To overcome this, we recommend using the [PostCSS Global Data](https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-global-data#readme)
-plugin which allows you to pass a list of files that will be globally available. The plugin won't inject any extra code
-in the output but will provide the context needed to resolve custom selectors.
-
-For it to run it needs to be placed before the [PostCSS Custom Selectors] plugin.
-
-```js
-const postcss = require('postcss');
-const postcssCustomSelectors = require('postcss-custom-selectors');
-const postcssGlobalData = require('@csstools/postcss-global-data');
-
-postcss([
- postcssGlobalData({
- files: [
- 'path/to/your/custom-selectors.css'
- ]
- }),
- postcssCustomSelectors(/* pluginOptions */)
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
-[css-url]: https://cssdb.org/#custom-selectors
-[discord]: https://discord.gg/bUadyRwkJS
-[npm-url]: https://www.npmjs.com/package/postcss-custom-selectors
-
-[PostCSS]: https://github.com/postcss/postcss
-[PostCSS Custom Selectors]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-custom-selectors
-[Custom Selectors Specification]: https://drafts.csswg.org/css-extensions/#custom-selectors