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-# PostCSS Custom Media [<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-media.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-media-queries.svg" height="20">][css-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/custom-media-queries.svg" height="20">][css-url]
-
-```bash
-npm install postcss-custom-media --save-dev
-```
-
-[PostCSS Custom Media] lets you define `@custom-media` in CSS following the [Custom Media Specification].
-
-```pcss
-@custom-media --small-viewport (max-width: 30em);
-
-@media (--small-viewport) {
- /* styles for small viewport */
-}
-
-/* becomes */
-
-@media (max-width: 30em) {
- /* styles for small viewport */
-}
-```
-
-## `true` and `false`
-
-With `@custom-media` you can use the constants `true` and `false`.
-These are especially handy when debugging.
-
-If you are unsure how your page is affected when a certain media query matches or not you can use these, to quickly toggle the results.
-This plugin downgrades these queries to something that works in all browsers.
-
-Quickly check the result as if the query matches:
-
-```pcss
-@custom-media --small-viewport true;
-
-@media (--small-viewport) {
- /* styles for small viewport */
-}
-
-/* becomes */
-
-@media (max-color:2147477350) {
- /* styles for small viewport */
-}
-```
-
-Quickly check the result as if the query does not match:
-
-```pcss
-@custom-media --small-viewport false;
-
-@media (--small-viewport) {
- /* styles for small viewport */
-}
-
-/* becomes */
-
-@media (color:2147477350) {
- /* styles for small viewport */
-}
-```
-
-## logical evaluation of complex media queries
-
-It is impossible to accurately and correctly resolve complex `@custom-media` queries
-as these depend on the browser the queries will eventually run in.
-
-_Some of these queries will have only one possible outcome but we have to account for all possible queries in this plugin._
-
-> [!NOTE]
-> When handling complex media queries you will see that your CSS is doubled for each level of complexity.<br>
-> GZIP works great to de-dupe this but having a lot of complex media queries will have a performance impact.
-
-An example of a very complex (and artificial) use-case :
-
-```pcss
-
-@custom-media --a-complex-query tty and (min-width: 300px);
-
-@media not screen and ((not (--a-complex-query)) or (color)) {
- /* Your CSS */
-}
-
-/* becomes */
-
-
-@media tty and (min-width: 300px) {
-@media not screen and ((not (max-color:2147477350)) or (color)) {
- /* Your CSS */
-}
-}
-@media not tty and (min-width: 300px) {
-@media not screen and ((not (color:2147477350)) or (color)) {
- /* Your CSS */
-}
-}
-```
-
-## Usage
-
-Add [PostCSS Custom Media] to your project:
-
-```bash
-npm install postcss postcss-custom-media --save-dev
-```
-
-Use it as a [PostCSS] plugin:
-
-```js
-const postcss = require('postcss');
-const postcssCustomMedia = require('postcss-custom-media');
-
-postcss([
- postcssCustomMedia(/* pluginOptions */)
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-[PostCSS Custom Media] 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
-postcssCustomMedia({ preserve: true })
-```
-
-```pcss
-@custom-media --small-viewport (max-width: 30em);
-
-@media (--small-viewport) {
- /* styles for small viewport */
-}
-
-/* becomes */
-
-@custom-media --small-viewport (max-width: 30em);
-
-@media (max-width: 30em) {
- /* styles for small viewport */
-}
-
-@media (--small-viewport) {
- /* styles for small viewport */
-}
-```
-
-## 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 media queries are not being resolved. This happens because each file is processed separately so
-unless you import the custom media query 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 media queries.
-
-For it to run it needs to be placed before the [PostCSS Custom Media] plugin.
-
-```js
-const postcss = require('postcss');
-const postcssCustomMedia = require('postcss-custom-media');
-const postcssGlobalData = require('@csstools/postcss-global-data');
-
-postcss([
- postcssGlobalData({
- files: [
- 'path/to/your/custom-media-queries.css'
- ]
- }),
- postcssCustomMedia(/* 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-media-queries
-[discord]: https://discord.gg/bUadyRwkJS
-[npm-url]: https://www.npmjs.com/package/postcss-custom-media
-
-[PostCSS]: https://github.com/postcss/postcss
-[PostCSS Custom Media]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-custom-media
-[Custom Media Specification]: https://www.w3.org/TR/mediaqueries-5/#at-ruledef-custom-media