PostCSS Relative Color Syntax [][PostCSS]

npm install @csstools/postcss-relative-color-syntax --save-dev

[PostCSS Relative Color Syntax] lets you use the relative color syntax in CSS color functions following [CSS Color Module 5].

``css
.example {
background: oklab(from oklab(54.3% -22.5% -5%) calc(1.0 - l) calc(a * 0.8) b);
}

/ becomes /

.example {
background: rgb(12, 100, 100);
}
`

> [!NOTE]
> We can not dynamically resolve var() arguments in relative color syntax, only static values will work.

Usage

Add [PostCSS Relative Color Syntax] to your project:

`bash
npm install postcss @csstools/postcss-relative-color-syntax --save-dev
`

Use it as a [PostCSS] plugin:

`js
const postcss = require('postcss');
const postcssRelativeColorSyntax = require('@csstools/postcss-relative-color-syntax');

postcss([
postcssRelativeColorSyntax(/ pluginOptions /)
]).process(YOUR_CSS /, processOptions /);
`

Options

$3

The preserve option determines whether the original notation
is preserved. By default, it is not preserved.

`js
postcssRelativeColorSyntax({ preserve: true })
`

`css
.example {
background: oklab(from oklab(54.3% -22.5% -5%) calc(1.0 - l) calc(a * 0.8) b);
}

/ becomes /

.example {
background: rgb(12, 100, 100);
background: oklab(from oklab(54.3% -22.5% -5%) calc(1.0 - l) calc(a * 0.8) b);
}
``

[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
[css-url]: https://cssdb.org/#relative-color-syntax
[discord]: https://discord.gg/bUadyRwkJS
[npm-url]: https://www.npmjs.com/package/@csstools/postcss-relative-color-syntax

[PostCSS]: https://github.com/postcss/postcss
[PostCSS Relative Color Syntax]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-relative-color-syntax
[CSS Color Module 5]: https://www.w3.org/TR/css-color-5/#relative-colors