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+# PostCSS Dir Pseudo Class [<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-dir-pseudo-class.svg" height="20">][npm-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/dir-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 Dir Pseudo Class] lets you style by directionality using the `:dir()`
+pseudo-class in CSS, following the [Selectors] specification.
+
+```pcss
+article h3:dir(rtl) {
+	margin-right: 10px;
+}
+
+article h3:dir(ltr) {
+	margin-left: 10px;
+}
+
+/* becomes */
+
+[dir="rtl"] article h3 {
+	margin-right: 10px;
+}
+
+[dir="ltr"] article h3 {
+	margin-left: 10px;
+}
+```
+
+### Maintaining Specificity
+
+Using [PostCSS Dir Pseudo Class] will not impact selector weight, but it will
+require having at least one `[dir]` attribute in your HTML. If you don’t have
+_any_ `[dir]` attributes, consider using the following JavaScript:
+
+```js
+// force at least one dir attribute (this can run at any time)
+document.documentElement.dir=document.documentElement.dir||'ltr';
+```
+
+If you absolutely cannot add a `[dir]` attribute in your HTML or even force one
+via JavaScript, you can still work around this by presuming a direction in your
+CSS using the [`dir` option](#dir), but understand that this will
+sometimes increase selector weight by one element (`html`).
+
+## Usage
+
+Add [PostCSS Dir Pseudo Class] to your project:
+
+```bash
+npm install postcss postcss-dir-pseudo-class --save-dev
+```
+
+Use it as a [PostCSS] plugin:
+
+```js
+const postcss = require('postcss');
+const postcssDirPseudoClass = require('postcss-dir-pseudo-class');
+
+postcss([
+	postcssDirPseudoClass(/* pluginOptions */)
+]).process(YOUR_CSS /*, processOptions */);
+```
+
+[PostCSS Dir Pseudo Class] 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
+postcssDirPseudoClass({ preserve: true })
+```
+
+```pcss
+article h3:dir(rtl) {
+	margin-right: 10px;
+}
+
+article h3:dir(ltr) {
+	margin-left: 10px;
+}
+
+/* becomes */
+
+[dir="rtl"] article h3 {
+	margin-right: 10px;
+}
+
+article h3:dir(rtl) {
+	margin-right: 10px;
+}
+
+[dir="ltr"] article h3 {
+	margin-left: 10px;
+}
+
+article h3:dir(ltr) {
+	margin-left: 10px;
+}
+```
+
+### dir
+
+The `dir` option allows you presume a direction in your CSS. By default, this
+is not specified and you are required to include a direction `[dir]` attribute
+somewhere in your HTML, preferably on the `html` element.
+
+```js
+postcssDirPseudoClass({ dir: 'ltr' });
+```
+
+```pcss
+article h3:dir(rtl) {
+	margin-right: 10px;
+}
+
+article h3:dir(ltr) {
+	margin-left: 10px;
+}
+
+/* becomes */
+
+[dir="rtl"] article h3 {
+	margin-right: 10px;
+}
+
+html:not([dir="rtl"]) article h3 {
+	margin-left: 10px;
+}
+```
+
+```js
+postcssDirPseudoClass({ dir: 'rtl' });
+```
+
+```pcss
+article h3:dir(rtl) {
+	margin-right: 10px;
+}
+
+article h3:dir(ltr) {
+	margin-left: 10px;
+}
+
+/* becomes */
+
+html:not([dir="ltr"]) article h3 {
+	margin-right: 10px;
+}
+
+[dir="ltr"] article h3 {
+	margin-left: 10px;
+}
+```
+
+### shadow
+
+The `shadow` option determines whether the CSS is assumed to be used in Shadow DOM with Custom Elements.
+
+```js
+postcssDirPseudoClass({ shadow: true })
+```
+
+```pcss
+article h3:dir(rtl) {
+	margin-right: 10px;
+}
+
+article h3:dir(ltr) {
+	margin-left: 10px;
+}
+
+/* becomes */
+
+:host-context([dir="rtl"]) article h3 {
+	margin-right: 10px;
+}
+
+:host-context([dir="ltr"]) article h3 {
+	margin-left: 10px;
+}
+```
+
+[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
+[css-url]: https://cssdb.org/#dir-pseudo-class
+[discord]: https://discord.gg/bUadyRwkJS
+[npm-url]: https://www.npmjs.com/package/postcss-dir-pseudo-class
+
+[PostCSS]: https://github.com/postcss/postcss
+[PostCSS Dir Pseudo Class]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-dir-pseudo-class
+[Selectors]: https://www.w3.org/TR/selectors-4/#the-dir-pseudo