> For the complete documentation index, see [llms.txt](https://bryan-guner.gitbook.io/my-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bryan-guner.gitbook.io/my-docs/redux/repos/examples/real-world/node_modules/postcss-dir-pseudo-class.md).

# PostCSS Dir Pseudo Class

[![NPM Version](https://img.shields.io/npm/v/postcss-dir-pseudo-class.svg)](https://www.npmjs.com/package/postcss-dir-pseudo-class) [![CSS Standard Status](https://cssdb.org/badge/dir-pseudo-class.svg)](https://cssdb.org/#dir-pseudo-class) [![Build Status](https://img.shields.io/travis/jonathantneal/postcss-dir-pseudo-class.svg)](https://travis-ci.org/jonathantneal/postcss-dir-pseudo-class) [![Support Chat](https://img.shields.io/badge/support-chat-blue.svg)](https://gitter.im/postcss/postcss)

[PostCSS Dir Pseudo Class](https://github.com/jonathantneal/postcss-dir-pseudo-class) lets you style by directionality using the `:dir()` pseudo-class in CSS, following the [Selectors](https://www.w3.org/TR/selectors-4/#the-dir-pseudo) specification.

```
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](https://github.com/jonathantneal/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-option), but understand that this will sometimes increase selector weight by one element (`html`).

## Usage

Add [PostCSS Dir Pseudo Class](https://github.com/jonathantneal/postcss-dir-pseudo-class) to your project:

```bash
npm install postcss-dir-pseudo-class --save-dev
```

Use [PostCSS Dir Pseudo Class](https://github.com/jonathantneal/postcss-dir-pseudo-class) to process your CSS:

```js
const postcssDirPseudoClass = require('postcss-dir-pseudo-class');

postcssDirPseudoClass.process(YOUR_CSS /*, processOptions, pluginOptions */);
```

Or use it as a [PostCSS](https://github.com/postcss/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](https://github.com/jonathantneal/postcss-dir-pseudo-class) runs in all Node environments, with special instructions for:

| [Node](https://github.com/bgoonz/Learning-Redux/blob/master/repos/examples/real-world/node_modules/postcss-dir-pseudo-class/INSTALL.md#node) | [PostCSS CLI](https://github.com/bgoonz/Learning-Redux/blob/master/repos/examples/real-world/node_modules/postcss-dir-pseudo-class/INSTALL.md#postcss-cli) | [Webpack](https://github.com/bgoonz/Learning-Redux/blob/master/repos/examples/real-world/node_modules/postcss-dir-pseudo-class/INSTALL.md#webpack) | [Create React App](https://github.com/bgoonz/Learning-Redux/blob/master/repos/examples/real-world/node_modules/postcss-dir-pseudo-class/INSTALL.md#create-react-app) | [Gulp](https://github.com/bgoonz/Learning-Redux/blob/master/repos/examples/real-world/node_modules/postcss-dir-pseudo-class/INSTALL.md#gulp) | [Grunt](https://github.com/bgoonz/Learning-Redux/blob/master/repos/examples/real-world/node_modules/postcss-dir-pseudo-class/INSTALL.md#grunt) |
| -------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |

## Options

### 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.

Here’s an example of using the `dir` option to presume a left-to-right direction:

```js
postcssDirPseudoClass({ dir: 'ltr' });
```

```
.example:dir(ltr) {
  margin-left: 10px;
}

.example:dir(rtl) {
  margin-right: 10px;
}

/* becomes */

html:not([dir="rtl"]) .example {
  margin-left: 10px;
}

[dir="rtl"] .example {
  margin-right: 10px;
}
```

### preserve

The `preserve` option determines whether the original `:dir()` rule should remain in the CSS. By default, the original rule is not preserved.

```js
postcssDirPseudoClass({ preserve: true });
```

```
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;
}
```