PostCSS Color Function

npm install @csstools/postcss-color-function --save-dev

PostCSS Color Function lets you use the color function in CSS, following the CSS Color specification.

.color {
    color: color(display-p3 0.64331 0.19245 0.16771);
}

:root {
    --a-color: color(srgb 0.64331 0.19245 0.16771);
}

/* becomes */

.color {
    color: rgb(179, 35, 35);
}

:root {
    --a-color: rgb(164, 49, 43);
}

Usage

Add PostCSS Color Function to your project:

npm install postcss @csstools/postcss-color-function --save-dev

Use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssColorFunction = require('@csstools/postcss-color-function');

postcss([
    postcssColorFunction(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);

Options

preserve

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

postcssColorFunction({ preserve: true })

.color {
    color: color(display-p3 0.64331 0.19245 0.16771);
}

:root {
    --a-color: color(srgb 0.64331 0.19245 0.16771);
}

/* becomes */

.color {
    color: rgb(179, 35, 35);
    color: color(display-p3 0.64331 0.19245 0.16771);
}

:root {
    --a-color: rgb(164, 49, 43);
}

@supports (color: color(display-p3 0 0 0%)) {
:root {
    --a-color: color(srgb 0.64331 0.19245 0.16771);
}
}

enableProgressiveCustomProperties

The enableProgressiveCustomProperties option determines whether the original notation is wrapped with @supports when used in Custom Properties. By default, it is enabled.

[!NOTE] 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.

postcssColorFunction({ enableProgressiveCustomProperties: false })

.color {
    color: color(display-p3 0.64331 0.19245 0.16771);
}

:root {
    --a-color: color(srgb 0.64331 0.19245 0.16771);
}

/* becomes */

.color {
    color: rgb(179, 35, 35);
    color: color(display-p3 0.64331 0.19245 0.16771);
}

:root {
    --a-color: rgb(164, 49, 43);
    --a-color: color(srgb 0.64331 0.19245 0.16771);
}

Custom properties do not fallback to the previous declaration

Supported Color Spaces

.color-spaces {
    color: color(a98-rgb 0.803 0.484 0.944);
    color: color(display-p3 0.8434 0.509 0.934);
    color: color(prophoto-rgb 0.759 0.493 0.898);
    color: color(rec2020 0.772 0.491 0.920);
    color: color(srgb 0.897 0.488 0.959);
    color: color(srgb-linear 0.783 0.203 0.910);
    color: color(xyz 0.560 0.377 0.904);
    color: color(xyz-d50 0.550 0.375 0.680);
    color: color(xyz-d65 0.560 0.377 0.904);
}

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).