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-# PostCSS Custom Properties [<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-properties.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-properties.svg" height="20">][css-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/custom-properties.svg" height="20">][css-url]
-
-```bash
-npm install postcss-custom-properties --save-dev
-```
-
-[PostCSS Custom Properties] lets you use Custom Properties in CSS, following
-the [CSS Custom Properties] specification.
-
-[!['Can I use' table](https://caniuse.bitsofco.de/image/css-variables.png)](https://caniuse.com/#feat=css-variables)
-
-```pcss
-:root {
- --color-blue-dark: rgb(0, 61, 184);
- --color-blue-light: rgb(0, 217, 255);
- --color-pink: rgb(255, 192, 211);
- --text-color: var(--color-pink);
-}
-
-.element {
- /* custom props */
- --border-color: var(--color-blue-light);
-
- /* props */
- border: 1px solid var(--border-color);
- color: var(--text-color);
-}
-
-.element--dark {
- --border-color: var(--color-blue-dark);
-}
-
-/* becomes */
-
-:root {
- --color-blue-dark: rgb(0, 61, 184);
- --color-blue-light: rgb(0, 217, 255);
- --color-pink: rgb(255, 192, 211);
- --text-color: var(--color-pink);
-}
-
-.element {
- /* custom props */
- --border-color: var(--color-blue-light);
-
- /* props */
- border: 1px solid rgb(0, 217, 255);
- border: 1px solid var(--border-color);
- color: rgb(255, 192, 211);
- color: var(--text-color);
-}
-
-.element--dark {
- --border-color: var(--color-blue-dark);
-}
-```
-
-**Note:**
-- Only processes variables that were defined in the `:root` or `html` selector.
-- Locally defined variables will be used as fallbacks only within the same rule, but not elsewhere.
-- Fallback values in `var()` will be used if the variable was not defined in the `:root` or `html` selector.
-
-## Usage
-
-Add [PostCSS Custom Properties] to your project:
-
-```bash
-npm install postcss postcss-custom-properties --save-dev
-```
-
-Use it as a [PostCSS] plugin:
-
-```js
-const postcss = require('postcss');
-const postcssCustomProperties = require('postcss-custom-properties');
-
-postcss([
- postcssCustomProperties(/* pluginOptions */)
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-[PostCSS Custom Properties] 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 properties using
-custom properties should be preserved in their original form. By default these are preserved.
-
-Custom property declarations are always preserved only `var()` functions can be omitted.
-
-```js
-postcssCustomProperties({ preserve: false })
-```
-
-```pcss
-:root {
- --color-blue-dark: rgb(0, 61, 184);
- --color-blue-light: rgb(0, 217, 255);
- --color-pink: rgb(255, 192, 211);
- --text-color: var(--color-pink);
-}
-
-.element {
- /* custom props */
- --border-color: var(--color-blue-light);
-
- /* props */
- border: 1px solid var(--border-color);
- color: var(--text-color);
-}
-
-.element--dark {
- --border-color: var(--color-blue-dark);
-}
-
-/* becomes */
-
-:root {
- --color-blue-dark: rgb(0, 61, 184);
- --color-blue-light: rgb(0, 217, 255);
- --color-pink: rgb(255, 192, 211);
- --text-color: var(--color-pink);
-}
-
-.element {
- /* custom props */
- --border-color: var(--color-blue-light);
-
- /* props */
- border: 1px solid var(--border-color);
- color: rgb(255, 192, 211);
-}
-
-.element--dark {
- --border-color: var(--color-blue-dark);
-}
-```
-
-## 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 properties are not being resolved. This happens because each file is processed separately so
-unless you import the custom properties 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 properties.
-
-For it to run it needs to be placed before the [PostCSS Custom Properties] plugin.
-
-```js
-const postcss = require('postcss');
-const postcssCustomProperties = require('postcss-custom-properties');
-const postcssGlobalData = require('@csstools/postcss-global-data');
-
-postcss([
- postcssGlobalData({
- files: [
- 'path/to/your/custom-selectors.css'
- ]
- }),
- postcssCustomProperties(/* 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-properties
-[discord]: https://discord.gg/bUadyRwkJS
-[npm-url]: https://www.npmjs.com/package/postcss-custom-properties
-
-[PostCSS]: https://github.com/postcss/postcss
-[PostCSS Custom Properties]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-custom-properties
-[CSS Custom Properties]: https://www.w3.org/TR/css-variables-1/