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+# PostCSS Focus Within [<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-focus-within.svg" height="20">][npm-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/focus-within-pseudo-class.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]
+
+[PostCSS Focus Within] lets you use the `:focus-within` pseudo-class in CSS, 
+following the [Selectors Level 4 specification].
+
+To use this feature you need to do two things :
+- add the [PostCSS plugin](#usage) that transforms the selector into a class or attribute
+- add the [browser polyfill](#browser) that sets the attribute or class on elements in a browser
+
+```pcss
+.my-form-field:focus-within label {
+	background-color: yellow;
+}
+
+/* becomes */
+
+.my-form-field[focus-within].js-focus-within label, .js-focus-within .my-form-field[focus-within] label {
+	background-color: yellow;
+}
+.my-form-field:focus-within label {
+	background-color: yellow;
+}
+```
+
+[PostCSS Focus Within] duplicates rules using the `:focus-within` pseudo-class
+with a `[focus-within]` attribute selector, the same selector used by the
+focus-within polyfill. This replacement selector can be changed using the
+`replaceWith` option. Also, the preservation of the original `:focus-within`
+rule can be disabled using the `preserve` option.
+
+## Usage
+
+Add [PostCSS Focus Within] to your project:
+
+```bash
+npm install postcss postcss-focus-within --save-dev
+```
+
+Use it as a [PostCSS] plugin:
+
+```js
+const postcss = require('postcss');
+const postcssFocusWithin = require('postcss-focus-within');
+
+postcss([
+	postcssFocusWithin(/* pluginOptions */)
+]).process(YOUR_CSS /*, processOptions */);
+```
+
+[PostCSS Focus Within] 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 preserved.
+
+```js
+postcssFocusWithin({ preserve: false })
+```
+
+```pcss
+.my-form-field:focus-within label {
+	background-color: yellow;
+}
+
+/* becomes */
+
+.my-form-field[focus-within].js-focus-within label, .js-focus-within .my-form-field[focus-within] label {
+	background-color: yellow;
+}
+```
+
+### replaceWith
+
+The `replaceWith` option defines the selector to replace `:focus-within`. By
+default, the replacement selector is `[focus-within]`.
+Please note that using a class, leverages `classList` under the hood which
+might  not be supported on some old browsers such as IE9, so you may need
+to polyfill `classList` in those cases.
+
+```js
+postcssFocusWithin({ replaceWith: '.focus-within' });
+```
+
+```pcss
+.my-form-field:focus-within label {
+	background-color: yellow;
+}
+
+/* becomes */
+
+.my-form-field.focus-within.js-focus-within label, .js-focus-within .my-form-field.focus-within label {
+	background-color: yellow;
+}
+.my-form-field:focus-within label {
+	background-color: yellow;
+}
+```
+
+Note that changing this option implies that it needs to be passed to the
+browser polyfill as well.
+
+### disablePolyfillReadyClass
+
+The `disablePolyfillReadyClass` option determines if selectors are prefixed with an indicator class.
+This class is only set on your document if the polyfill loads and is needed.
+
+By default this option is `false`.
+Set this to `true` to prevent the class from being added.
+
+```js
+postcssFocusWithin({ disablePolyfillReadyClass: true })
+```
+
+```pcss
+.my-form-field:focus-within label {
+	background-color: yellow;
+}
+
+/* becomes */
+
+.my-form-field[focus-within] label {
+	background-color: yellow;
+}
+.my-form-field:focus-within label {
+	background-color: yellow;
+}
+```
+
+## Browser
+
+```js
+import focusWithinInit from 'postcss-focus-within/browser';
+
+focusWithinInit();
+```
+
+or
+
+```html
+<!-- When using a CDN url you will have to manually update the version number -->
+<script src="https://unpkg.com/postcss-focus-within@8.0.0/dist/browser-global.js"></script>
+<script>focusWithinInit()</script>
+```
+
+[PostCSS Focus Within] works in all major browsers, including Safari 6+ and
+Internet Explorer 9+ without any additional polyfills.
+
+### Browser Usage
+
+#### force
+
+The `force` option determines whether the library runs even if the browser
+supports the selector or not. By default, it won't run if the browser does
+support the selector.
+
+```js
+focusWithinInit({ force: true });
+```
+
+#### replaceWith
+
+Similar to the option for the PostCSS Plugin, `replaceWith` determines the
+attribute or class to apply to an element when it's considered to be `:focus-within`.
+
+```js
+focusWithinInit({ replaceWith: '.focus-within });
+```
+
+This option should be used if it was changed at PostCSS configuration level.
+
+### Using with Next.js
+
+Given that Next.js imports packages both on the browser and on the server, you need to make sure that the package is only imported on the browser.
+
+As outlined in the [Next.js documentation](https://nextjs.org/docs/advanced-features/dynamic-import#with-external-libraries), you need to load the package with a dynamic import:
+
+```jsx
+useEffect(async () => {
+	const focusWithinInit = (await import('postcss-focus-within/browser')).default;
+	focusWithinInit();
+}, []);
+```
+
+[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
+[css-url]: https://cssdb.org/#focus-within-pseudo-class
+[discord]: https://discord.gg/bUadyRwkJS
+[npm-url]: https://www.npmjs.com/package/postcss-focus-within
+
+[PostCSS]: https://github.com/postcss/postcss
+[PostCSS Focus Within]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-focus-within
+[Selectors Level 4 specification]: https://www.w3.org/TR/selectors-4/#the-focus-within-pseudo