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authorlittleblack111 <littleblack11111@gmail.com>2026-05-18 23:10:59 +0800
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-# PostCSS Progressive Custom Properties [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS" width="90" height="90" align="right">][postcss]
-
-[![NPM Version][npm-img]][npm-url]
-[![Build Status][cli-img]][cli-url]
-[<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord]
-
-[PostCSS Progressive Custom Properties] is a utility plugin to correctly declare Custom Property fallbacks and enhancements.
-
-> [!WARNING]
-> It is not intended to be used directly by stylesheet authors.
-> Meant to be included in other PostCSS plugins that provide CSS value transforms as fallbacks.
-
-[Custom Properties are not discarded like regular declarations when invalid.](https://www.w3.org/TR/css-variables-1/#invalid-variables)
-This makes it tricky to provide fallback values for older browsers.
-
-The solution is to wrap Custom Property declarations in an `@supports` rule.
-
-```pcss
-:root {
- /* fallback */
- --a-color: red;
- /* progressive enhancement */
- --a-color: oklch(40% 0.234 0.39 / var(--opacity-50));
-}
-
-/* becomes */
-
-:root {
- --a-color: red;
-}
-
-@supports (color: oklch(0% 0 0)) {
- :root {
- --a-color: oklch(40% 0.234 0.39 / var(--opacity-50));
- }
-}
-```
-
-## Ignored values
-
-`initial` and `<white space>` are ignored.
-
-```pcss
-.initial {
- --prop-1: red;
- --prop-1: initial;
-}
-
-.white-space {
- --prop-1: red;
- --prop-1:;
-
- --prop-2: red;
- --prop-2: ;
-
- --prop-3: red;
- --prop-3: ;
-}
-
-/* remains */
-
-.initial {
- --prop-1: red;
- --prop-1: initial;
-}
-
-.white-space {
- --prop-1: red;
- --prop-1:;
-
- --prop-2: red;
- --prop-2: ;
-
- --prop-3: red;
- --prop-3: ;
-}
-```
-
-## Usage
-
-Add [PostCSS Progressive Custom Properties] to your project:
-
-```bash
-npm install @csstools/postcss-progressive-custom-properties --save-dev
-```
-
-Use [PostCSS Progressive Custom Properties] as a [PostCSS] plugin:
-
-```js
-const postcss = require('postcss');
-const postcssCustomProperties = require('@csstools/postcss-progressive-custom-properties');
-
-postcss([
- postcssProgressiveCustomProperties()
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-## @supports
-
-This plugin wraps Custom Property override declarations in an `@supports` rule.
-With PostCSS 8 this trigger declaration visitors to run again.
-
-Make sure your plugin detects and ignores values inside relevant `@supports` rules.
-
-## Reading list
-
-- https://moderncss.dev/how-custom-property-values-are-computed/
-
-[PostCSS Progressive Custom Properties] runs in all Node environments, with special instructions for:
-
-| [Node](INSTALL.md#node) | [PostCSS CLI](INSTALL.md#postcss-cli) | [Webpack](INSTALL.md#webpack) | [Gulp](INSTALL.md#gulp) | [Grunt](INSTALL.md#grunt) |
-| --- | --- | --- | --- | --- |
-
-
-[cli-img]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml/badge.svg
-[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
-[discord]: https://discord.gg/bUadyRwkJS
-[npm-img]: https://img.shields.io/npm/v/@csstools/postcss-progressive-custom-properties.svg
-[npm-url]: https://www.npmjs.com/package/@csstools/postcss-progressive-custom-properties
-
-[PostCSS]: https://github.com/postcss/postcss
-[PostCSS Progressive Custom Properties]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-progressive-custom-properties