168 lines
4.8 KiB
Markdown
168 lines
4.8 KiB
Markdown
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# PostCSS Lab Function [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS Logo" width="90" height="90" align="right">][postcss]
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[<img alt="npm version" src="https://img.shields.io/npm/v/postcss-lab-function.svg" height="20">][npm-url]
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[<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/lab-function.svg" height="20">][css-url]
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[<img alt="Build Status" src="https://github.com/csstools/postcss-plugins/workflows/test/badge.svg" height="20">][cli-url]
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[<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord]
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[PostCSS Lab Function] lets you use `lab` and `lch` color functions in
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CSS, following the [CSS Color] specification.
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```pcss
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.color-lab {
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color: lab(40% 56.6 39);
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}
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.color-lch {
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color: lch(40% 68.735435 34.568626);
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}
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/* becomes */
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.color {
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color: rgb(179, 35, 35);
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color: color(display-p3 0.64331 0.19245 0.16771);
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}
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.color-lch {
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color: rgb(179, 35, 35);
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color: color(display-p3 0.64331 0.19245 0.16771);
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}
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```
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## Usage
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Add [PostCSS Lab Function] to your project:
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```bash
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npm install postcss postcss-lab-function --save-dev
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```
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Use it as a [PostCSS] plugin:
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```js
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const postcss = require('postcss');
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const postcssLabFunction = require('postcss-lab-function');
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postcss([
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postcssLabFunction(/* pluginOptions */)
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]).process(YOUR_CSS /*, processOptions */);
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```
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[PostCSS Lab Function] runs in all Node environments, with special
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instructions for:
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| [Node](INSTALL.md#node) | [PostCSS CLI](INSTALL.md#postcss-cli) | [Webpack](INSTALL.md#webpack) | [Create React App](INSTALL.md#create-react-app) | [Gulp](INSTALL.md#gulp) | [Grunt](INSTALL.md#grunt) |
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| --- | --- | --- | --- | --- | --- |
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## Options
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### preserve
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The `preserve` option determines whether the original functional color notation
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is preserved. By default, it is not preserved.
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```js
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postcssLabFunction({ preserve: true })
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```
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```pcss
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.color {
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color: lab(40% 56.6 39);
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}
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/* becomes */
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.color {
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color: rgb(179, 35, 35);
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color: color(display-p3 0.64331 0.19245 0.16771);
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color: lab(40% 56.6 39);
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}
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```
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### enableProgressiveCustomProperties
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The `enableProgressiveCustomProperties` option determines whether the original notation
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is wrapped with `@supports` when used in Custom Properties. By default, it is enabled.
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⚠️ 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).
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```js
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postcssLabFunction({ enableProgressiveCustomProperties: false })
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```
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```pcss
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:root {
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--firebrick: lab(40% 56.6 39);
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}
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/* becomes */
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:root {
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--firebrick: rgb(178, 34, 34); /* will never be used, not even in older browser */
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--firebrick: color(display-p3 0.64331 0.19245 0.16771); /* will never be used, not even in older browser */
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--firebrick: lab(40% 56.6 39);
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}
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```
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### subFeatures
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#### displayP3
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The `subFeatures.displayP3` option determines if `color(display-p3 ...)` is used as a fallback.<br>
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By default, it is enabled.
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`display-p3` can display wider gamut colors than `rgb` on some devices.
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```js
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postcssOKLabFunction({
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subFeatures: {
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displayP3: false
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}
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})
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```
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```pcss
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.color {
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color: lab(40% 56.6 39);
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}
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/* becomes */
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.color {
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color: rgb(179, 35, 35);
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color: lab(40% 56.6 39);
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}
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```
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## Out of gamut colors
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Depending on the browser implementation out of gamut colors may be clipped, resulting in a different color.<br>
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Fallback values generated by [PostCSS Lab Function] are always mapped to a close alternative in sRGB.
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When setting `preserve` to `true` the original values will be used by some browsers and these may be clipped.<br>
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Certain browsers will have an incorrect color if this occurs.
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If the plugin detects out of gamut colors it will emit a warning :
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> "lch(95% 210 285)" is out of gamut for "display-p3". When "preserve: true" is set this will lead to unexpected results in some browsers.
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To resolve this warning you can use a color that is in gamut for `display-p3`.
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## Copyright : color conversions
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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).
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[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
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[css-url]: https://cssdb.org/#lab-function
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[discord]: https://discord.gg/bUadyRwkJS
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[npm-url]: https://www.npmjs.com/package/postcss-lab-function
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[CSS Color]: https://drafts.csswg.org/css-color/#specifying-lab-lch
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[Gulp PostCSS]: https://github.com/postcss/gulp-postcss
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[Grunt PostCSS]: https://github.com/nDmitry/grunt-postcss
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[PostCSS]: https://github.com/postcss/postcss
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[PostCSS Loader]: https://github.com/postcss/postcss-loader
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[PostCSS Lab Function]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-lab-function
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