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+# PostCSS OKLab Function [<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/@csstools/postcss-oklab-function.svg" height="20">][npm-url]
+[<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/oklab-function.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 OKLab Function] lets you use `oklab` and `oklch` color functions in
+CSS, following the [CSS Color] specification.
+
+```pcss
+.test-oklab {
+	color: oklab(40% 0.001236 0.0039);
+}
+
+.test-oklch {
+	color: oklch(40% 0.268735435 34.568626);
+}
+
+/* becomes */
+
+.test-oklab {
+	color: rgb(73, 71, 69);
+	color: color(display-p3 0.28515 0.27983 0.27246);
+}
+
+.test-oklch {
+	color: rgb(131, 28, 0);
+	color: color(display-p3 0.49163 0.11178 0.00000);
+}
+```
+
+## Usage
+
+Add [PostCSS OKLab Function] to your project:
+
+```bash
+npm install postcss @csstools/postcss-oklab-function --save-dev
+```
+
+Use it as a [PostCSS] plugin:
+
+```js
+const postcss = require('postcss');
+const postcssOKLabFunction = require('@csstools/postcss-oklab-function');
+
+postcss([
+  postcssOKLabFunction(/* pluginOptions */)
+]).process(YOUR_CSS /*, processOptions */);
+```
+
+[PostCSS OKLab Function] 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) |
+| --- | --- | --- | --- | --- |
+
+## Options
+
+### preserve
+
+The `preserve` option determines whether the original notation
+is preserved. By default, it is not preserved.
+
+```js
+postcssOKLabFunction({ preserve: true })
+```
+
+```pcss
+.test-oklab {
+	color: oklab(40% 0.001236 0.0039);
+}
+
+.test-oklch {
+	color: oklch(40% 0.268735435 34.568626);
+}
+
+/* becomes */
+
+.test-oklab {
+	color: rgb(73, 71, 69);
+	color: color(display-p3 0.28515 0.27983 0.27246);
+	color: oklab(40% 0.001236 0.0039);
+}
+
+.test-oklch {
+	color: rgb(131, 28, 0);
+	color: color(display-p3 0.49163 0.11178 0.00000);
+	color: oklch(40% 0.268735435 34.568626);
+}
+```
+
+### enableProgressiveCustomProperties
+
+The `enableProgressiveCustomProperties` option determines whether the original notation
+is wrapped with `@supports` when used in Custom Properties. By default, it is enabled.
+
+⚠️ We only recommend disabling this when you set `preserve` to `false` or if you bring your own fix for Custom Properties. See what the plugin does in its [README](https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-progressive-custom-properties#readme).
+
+```js
+postcssOKLabFunction({ enableProgressiveCustomProperties: false })
+```
+
+```pcss
+:root {
+	--firebrick: oklab(40% 0.234 0.39);
+}
+
+/* becomes */
+
+:root {
+	--firebrick: rgb(133, 0, 67); /* will never be used, not even in older browser */
+	--firebrick: color(display-p3 0.49890 0.00000 0.25954); /* will never be used, not even in older browser */
+	--firebrick: oklab(40% 0.234 0.39);
+}
+```
+
+### subFeatures
+
+#### displayP3
+
+The `subFeatures.displayP3` option determines if `color(display-p3 ...)` is used as a fallback.<br>
+By default, it is enabled.
+
+`display-p3` can display wider gamut colors than `rgb` on some devices.
+
+```js
+postcssOKLabFunction({
+	subFeatures: {
+		displayP3: false
+	}
+})
+```
+
+```pcss
+.test-oklab {
+	color: oklab(40% 0.001236 0.0039);
+}
+
+.test-oklch {
+	color: oklch(40% 0.268735435 34.568626);
+}
+
+/* becomes */
+
+.test-oklab {
+	color: rgb(73, 71, 69);
+}
+
+.test-oklch {
+	color: rgb(131, 28, 0);
+}
+```
+
+## Copyright : color conversions
+
+This software or document includes material copied from or derived from https://github.com/w3c/csswg-drafts/tree/main/css-color-4. Copyright © 2022 W3C® (MIT, ERCIM, Keio, Beihang).
+
+[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
+[css-url]: https://cssdb.org/#oklab-function
+[discord]: https://discord.gg/bUadyRwkJS
+[npm-url]: https://www.npmjs.com/package/@csstools/postcss-oklab-function
+
+[CSS Color]: https://www.w3.org/TR/css-color-4/#specifying-oklab-oklch
+[Gulp PostCSS]: https://github.com/postcss/gulp-postcss
+[Grunt PostCSS]: https://github.com/nDmitry/grunt-postcss
+[PostCSS]: https://github.com/postcss/postcss
+[PostCSS Loader]: https://github.com/postcss/postcss-loader
+[PostCSS OKLab Function]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-oklab-function