# PostCSS Logical Properties and Values [PostCSS Logo][postcss] [![NPM Version][npm-img]][npm-url] [![CSS Standard Status][css-img]][css-url] [![Build Status][cli-img]][cli-url] [Discord][discord] [PostCSS Logical Properties and Values] lets you use logical, rather than physical, direction and dimension mappings in CSS, following the [CSS Logical Properties and Values] specification. [!['Can I use' table](https://caniuse.bitsofco.de/image/css-logical-props.png)](https://caniuse.com/#feat=css-logical-props) ```pcss .banner { color: #222222; inset: logical 0 5px 10px; padding-inline: 20px 40px; resize: block; transition: color 200ms; } /* becomes */ .banner:dir(ltr) { padding-left: 20px; padding-right: 40px; } .banner:dir(rtl) { padding-right: 20px; padding-left: 40px; } .banner { color: #222222; top: 0; left: 5px; bottom: 10px; right: 5px; resize: vertical; transition: color 200ms; } /* or, when used with { dir: 'ltr' } */ .banner { color: #222222; top: 0; left: 5px; bottom: 10px; right: 5px; padding-left: 20px; padding-right: 40px; resize: vertical; transition: color 200ms; } /* or, when used with { preserve: true } */ .banner:dir(ltr) { padding-left: 20px; padding-right: 40px; } .banner:dir(rtl) { padding-right: 20px; padding-left: 40px; } .banner { color: #222222; top: 0; left: 5px; bottom: 10px; right: 5px; inset: logical 0 5px 10px; padding-inline: 20px 40px; resize: vertical; resize: block; transition: color 200ms; } ``` These shorthand properties set values for physical properties by default. Specifying the `logical` keyboard at the beginning of the property value will transform the flow-relative values afterward into both physical LTR and RTL properties: #### Logical Borders - `border`, `border-block`, `border-block-start`, `border-block-end`, `border-inline`, `border-inline-start`, `border-inline-end`, `border-start`, `border-end`, `border-color`, `border-block-color`, `border-block-start-color`, `border-block-end-color`, `border-inline-color`, `border-inline-start-color`, `border-inline-end-color`, `border-start-color`, `border-end-color`, `border-style`, `border-block-style`, `border-block-start-style`, `border-block-end-style`, `border-inline-style`, `border-inline-start-style`, `border-inline-end-style`, `border-start-style`, `border-end-style`, `border-width`, `border-block-width`, `border-block-start-width`, `border-block-end-width`, `border-inline-width`, `border-inline-start-width`, `border-inline-end-width`, `border-start-width`, `border-end-width`, `border-start-start-radius`, `border-start-end-radius`, `border-end-start-radius`, `border-end-end-radius` #### Logical Offsets - `inset`, `inset-block`, `inset-block-start`, `inset-block-end`, `inset-inline`, `inset-inline-start`, `inset-inline-end`, `inset-start`, `inset-end` #### Logical Margins - `margin`, `margin-block`, `margin-block-start`, `margin-block-end`, `margin-inline`, `margin-inline-start`, `margin-inline-end`, `margin-start`, `margin-end` #### Logical Paddings - `padding`, `padding-block`, `padding-block-start`, `padding-block-end`, `padding-inline`, `padding-inline-start`, `padding-inline-end`, `padding-start`, `padding-end` #### Logical Sizes - `block-size`, `max-block-size`, `min-block-size`, `inline-size`, `max-inline-size`, `min-inline-size` #### Flow-Relative Values - `clear: inline-start`, `clear: inline-end`, `float: inline-start`, `float: inline-end`, `text-align: start`, `text-align: end` --- By default, [PostCSS Logical Properties and Values] creates fallback selectors which require at least one `[dir]` attribute in your HTML. If you don’t have any `[dir]` attributes, consider using the following JavaScript: ```js // force at least one dir attribute (this can run at any time) document.documentElement.dir = document.documentElement.dir || 'ltr'; ``` Otherwise, consider using the `dir` option to transform all logical properties and values to a specific direction. ```js require('postcss-logical')({ dir: 'ltr' }); ``` ## Usage Add [PostCSS Logical Properties and Values] to your project: ```bash npm install postcss-logical --save-dev ``` Use [PostCSS Logical Properties and Values] as a [PostCSS] plugin: ```js const postcss = require('postcss'); const postcssLogical = require('postcss-logical'); postcss([ postcssLogical(/* pluginOptions */) ]).process(YOUR_CSS /*, processOptions */); ``` [PostCSS Logical Properties and Values] runs in all Node environments, with special instructions for: | [Node](INSTALL.md#node) | [PostCSS CLI](INSTALL.md#postcss-cli) | [Webpack](INSTALL.md#webpack) | [Create React App](INSTALL.md#create-react-app) | [Gulp](INSTALL.md#gulp) | [Grunt](INSTALL.md#grunt) | | --- | --- | --- | --- | --- | --- | ## Options ### dir The `dir` option determines how directional fallbacks should be added to CSS. By default, fallbacks replace the logical declaration with nested `:dir` pseudo-classes. If `dir` is defined as `ltr` or `rtl` then only the left or right directional fallbacks will replace the logical declarations. If `preserve` is defined as `true`, then the `dir` option will be ignored. ### preserve The `preserve` option determines whether directional fallbacks should be added before logical declarations without replacing them. By default, directional fallbacks replace logical declaration. If `preserve` is defined as `true`, then the `dir` option will be ignored. ## :dir() pseudo class This plugin transforms using the `:dir(ltr)` pseudo class. Use [postcss-dir-pseudo-class](https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-dir-pseudo-class#readme) to further transform to `[dir="ltr"]`. Currently `:dir(ltr)` doesn't have great browser support but this will improve over time. [css-img]: https://cssdb.org/images/badges/logical-properties-and-values.svg [css-url]: https://cssdb.org/#logical-properties-and-values [cli-img]: https://github.com/csstools/postcss-plugins/workflows/test/badge.svg [cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test [discord]: https://discord.gg/bUadyRwkJS [npm-img]: https://img.shields.io/npm/v/postcss-logical.svg [npm-url]: https://www.npmjs.com/package/postcss-logical [CSS Logical Properties and Values]: https://drafts.csswg.org/css-logical/ [Gulp PostCSS]: https://github.com/postcss/gulp-postcss [Grunt PostCSS]: https://github.com/nDmitry/grunt-postcss [PostCSS]: https://github.com/postcss/postcss [PostCSS Loader]: https://github.com/postcss/postcss-loader [PostCSS Logical Properties and Values]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-logical