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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="CSS Standard Status" src="https://cssdb.org/images/badges/custom-selectors.svg" height="20">][css-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]
+
+```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