PostCSS System UI Font Family [][PostCSS]

npm install @csstools/postcss-system-ui-font-family --save-dev

[PostCSS System UI Font Family] lets you use the system-ui keyword following the [CSS Fonts 4 Specification].

``css
.foo {
font: italic bold 12px/30px system-ui;
font-family: system-ui;
--font-family: system-ui;
}

/ becomes /

.foo {
font: italic bold 12px/30px system-ui;
font-family: system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;
--font-family: system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;
}
`

Usage

Add [PostCSS System UI Font Family] to your project:

`bash
npm install postcss @csstools/postcss-system-ui-font-family --save-dev
`

Use it as a [PostCSS] plugin:

`js
const postcss = require('postcss');
const postcssSystemUIFontFamily = require('@csstools/postcss-system-ui-font-family');

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

Options

$3

The preserve option determines whether the original notation
is preserved. By default, it is preserved.

`js
postcssSystemUIFontFamily({ preserve: false })
`

`css
.foo {
font: italic bold 12px/30px system-ui;
font-family: system-ui;
--font-family: system-ui;
}

/ becomes /

.foo {
font: italic bold 12px/30px system-ui;
font-family: -apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;
--font-family: -apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;
}
``

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

[PostCSS]: https://github.com/postcss/postcss
[PostCSS System UI Font Family]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-system-ui-font-family
[CSS Fonts 4 Specification]: https://drafts.csswg.org/css-fonts-4/#system-ui-def