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postcss-lab-function

README.md

PostCSS Lab Function PostCSS Logo

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Baseline Status CSS Standard Status

PostCSS Lab Function lets you use lab and lch color functions in CSS, following the CSS Color specification.

.color-lab {
	color: lab(40% 56.6 39);
}

.color-lch {
	color: lch(40% 68.735435 34.568626);
}

/* becomes */

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

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

Usage

Add PostCSS Lab Function to your project:

npm install postcss postcss-lab-function --save-dev

Use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssLabFunction = require('postcss-lab-function');

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

PostCSS Lab Function runs in all Node environments, with special instructions for:

Node PostCSS CLI Webpack Gulp Grunt

Options

preserve

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

postcssLabFunction({ preserve: true })
.color {
	color: lab(40% 56.6 39);
}

/* becomes */

.color {
	color: rgb(179, 35, 35);
	color: color(display-p3 0.64331 0.19245 0.16771);
	color: lab(40% 56.6 39);
}

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.

postcssLabFunction({ enableProgressiveCustomProperties: false })
:root {
	--firebrick: lab(40% 56.6 39);
}

/* becomes */

:root {
	--firebrick: rgb(178, 34, 34); /* will never be used, not even in older browser */
	--firebrick: color(display-p3 0.64331 0.19245 0.16771); /* will never be used, not even in older browser */
	--firebrick: lab(40% 56.6 39);
}

subFeatures

displayP3

The subFeatures.displayP3 option determines if color(display-p3 ...) is used as a fallback.
By default, it is enabled.

display-p3 can display wider gamut colors than rgb on some devices.

postcssOKLabFunction({
	subFeatures: {
		displayP3: false
	}
})
.color {
	color: lab(40% 56.6 39);
}

/* becomes */

.color {
	color: rgb(179, 35, 35);
	color: lab(40% 56.6 39);
}

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).