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+# PostCSS Logical Viewport Units [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS Logo" width="90" height="90" align="right">][PostCSS]
+
+[<img alt="npm version" src="https://img.shields.io/npm/v/@csstools/postcss-logical-viewport-units.svg" height="20">][npm-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/logical-viewport-units.svg" height="20">][css-url] [<img alt="Build Status" src="https://github.com/csstools/postcss-plugins/workflows/test/badge.svg" height="20">][cli-url] [<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord]
+
+```bash
+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].
+
+```pcss
+.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 */);
+```
+
+[PostCSS Logical Viewport Units] runs in all Node environments, with special
+instructions for:
+
+- [Node](INSTALL.md#node)
+- [PostCSS CLI](INSTALL.md#postcss-cli)
+- [PostCSS Load Config](INSTALL.md#postcss-load-config)
+- [Webpack](INSTALL.md#webpack)
+- [Next.js](INSTALL.md#nextjs)
+- [Gulp](INSTALL.md#gulp)
+- [Grunt](INSTALL.md#grunt)
+
+## Options
+
+### inlineDirection
+
+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'
+})
+```
+
+```pcss
+.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`.
+
+### preserve
+
+The `preserve` option determines whether the original notation
+is preserved. By default, it is preserved.
+
+```js
+postcssLogicalViewportUnits({ preserve: false })
+```
+
+```pcss
+.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