PostCSS Logical Viewport Units [][PostCSS]

npm install @csstools/postcss-logical-viewport-units --save-dev

[PostCSS Logical Viewport Units] lets you easily use vb and vi length units following the [CSS-Values-4 Specification].

``css
.foo {
margin: 10vi 20vb;
}

/ becomes /

.foo {
margin: 10vw 20vh;
margin: 10vi 20vb;
}
`

Usage

Add [PostCSS Logical Viewport Units] to your project:

`bash
npm install postcss @csstools/postcss-logical-viewport-units --save-dev
`

Use it as a [PostCSS] plugin:

`js
const postcss = require('postcss');
const postcssLogicalViewportUnits = require('@csstools/postcss-logical-viewport-units');

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

Options

$3

The inlineDirection option allows you to specify the direction of the inline axe. The default value is left-to-right, which would match any latin language.

You should tweak this value so that it is specific to your language and writing mode.

`js
postcssLogicalViewportUnits({
inlineDirection: 'top-to-bottom'
})
`

`css
.foo {
margin: 10vi 20vb;
}

/ becomes /

.foo {
margin: 10vh 20vw;
margin: 10vi 20vb;
}
`

Each direction must be one of the following:

- top-to-bottom
- bottom-to-top
- left-to-right
- right-to-left

Please do note that transformations won't do anything particular for right-to-left or bottom-to-top.

$3

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

`js
postcssLogicalViewportUnits({ preserve: false })
`

`css
.foo {
margin: 10vi 20vb;
}

/ becomes /

.foo {
margin: 10vw 20vh;
}
``

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

[PostCSS]: https://github.com/postcss/postcss
[PostCSS Logical Viewport Units]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-logical-viewport-units
[CSS-Values-4 Specification]: https://www.w3.org/TR/css-values-4/#viewport-relative-units