# PostCSS Color Functional Notation [
][postcss]
[
][npm-url]
[
][css-url]
[
][cli-url]
[
][discord]
[PostCSS Color Functional Notation] lets you use space and slash separated
color notation in CSS, following the [CSS Color] specification.
```pcss
:root {
--firebrick: rgb(178 34 34);
--firebrick-a50: rgb(70% 13.5% 13.5% / 50%);
--firebrick-hsl: hsla(0 68% 42%);
--firebrick-hsl-a50: hsl(0 68% 42% / 50%);
}
/* becomes */
:root {
--firebrick: rgb(178, 34, 34);
--firebrick-a50: rgba(178, 34, 34, .5);
--firebrick-hsl: hsl(0, 68%, 42%);
--firebrick-hsl-a50: hsla(0, 68%, 42%, .5);
}
```
## Usage
Add [PostCSS Color Functional Notation] to your project:
```bash
npm install postcss-color-functional-notation --save-dev
```
Use [PostCSS Color Functional Notation] to process your CSS:
```js
const postcss = require('postcss');
const postcssColorFunctionalNotation = require('postcss-color-functional-notation');
postcss([
postcssColorFunctionalNotation(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);
```
[PostCSS Color Functional Notation] runs in all Node environments, with special instructions for:
| [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) |
| --- | --- | --- | --- | --- | --- |
## Options
### preserve
The `preserve` option determines whether the original functional color notation
is preserved. By default, it is not preserved.
```js
postcssImageSetFunction({ preserve: true })
```
```pcss
:root {
--firebrick: rgb(178 34 34);
--firebrick-a50: rgb(70% 13.5% 13.5% / 50%);
--firebrick-hsl: hsla(0 68% 42%);
--firebrick-hsl-a50: hsl(0 68% 42% / 50%);
}
/* becomes */
:root {
--firebrick: rgb(178, 34, 34);
--firebrick: rgb(178 34 34);
--firebrick-a50: rgba(178, 34, 34, .5);
--firebrick-a50: rgb(70% 13.5% 13.5% / 50%);
--firebrick-hsl: hsl(0, 68%, 42%);
--firebrick-hsl: hsla(0 68% 42%);
--firebrick-hsl-a50: hsla(0, 68%, 42%, .5);
--firebrick-hsl-a50: hsl(0 68% 42% / 50%);
}
```
[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
[css-url]: https://cssdb.org/#color-functional-notation
[discord]: https://discord.gg/bUadyRwkJS
[npm-url]: https://www.npmjs.com/package/postcss-color-functional-notation
[CSS Color]: https://drafts.csswg.org/css-color/#ref-for-funcdef-rgb%E2%91%A1%E2%91%A0
[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 Color Functional Notation]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-functional-notation