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211 lines
6.8 KiB
211 lines
6.8 KiB
# PostCSS Logical Properties and Values [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS Logo" width="90" height="90" align="right">][postcss] |
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[![NPM Version][npm-img]][npm-url] |
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[![CSS Standard Status][css-img]][css-url] |
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[![Build Status][cli-img]][cli-url] |
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[<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord] |
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[PostCSS Logical Properties and Values] lets you use logical, rather than |
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physical, direction and dimension mappings in CSS, following the |
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[CSS Logical Properties and Values] specification. |
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[!['Can I use' table](https://caniuse.bitsofco.de/image/css-logical-props.png)](https://caniuse.com/#feat=css-logical-props) |
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```pcss |
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.banner { |
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color: #222222; |
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inset: logical 0 5px 10px; |
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padding-inline: 20px 40px; |
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resize: block; |
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transition: color 200ms; |
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} |
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/* becomes */ |
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.banner:dir(ltr) { |
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padding-left: 20px; |
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padding-right: 40px; |
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} |
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.banner:dir(rtl) { |
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padding-right: 20px; |
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padding-left: 40px; |
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} |
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.banner { |
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color: #222222; |
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top: 0; |
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left: 5px; |
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bottom: 10px; |
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right: 5px; |
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resize: vertical; |
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transition: color 200ms; |
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} |
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/* or, when used with { dir: 'ltr' } */ |
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.banner { |
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color: #222222; |
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top: 0; |
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left: 5px; |
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bottom: 10px; |
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right: 5px; |
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padding-left: 20px; |
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padding-right: 40px; |
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resize: vertical; |
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transition: color 200ms; |
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} |
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/* or, when used with { preserve: true } */ |
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.banner:dir(ltr) { |
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padding-left: 20px; |
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padding-right: 40px; |
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} |
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.banner:dir(rtl) { |
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padding-right: 20px; |
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padding-left: 40px; |
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} |
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.banner { |
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color: #222222; |
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top: 0; |
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left: 5px; |
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bottom: 10px; |
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right: 5px; |
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inset: logical 0 5px 10px; |
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padding-inline: 20px 40px; |
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resize: vertical; |
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resize: block; |
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transition: color 200ms; |
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} |
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``` |
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These shorthand properties set values for physical properties by default. |
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Specifying the `logical` keyboard at the beginning of the property value will |
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transform the flow-relative values afterward into both physical LTR and RTL |
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properties: |
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#### Logical Borders |
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- `border`, `border-block`, `border-block-start`, `border-block-end`, |
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`border-inline`, `border-inline-start`, `border-inline-end`, `border-start`, |
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`border-end`, `border-color`, `border-block-color`, |
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`border-block-start-color`, `border-block-end-color`, `border-inline-color`, |
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`border-inline-start-color`, `border-inline-end-color`, `border-start-color`, |
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`border-end-color`, `border-style`, `border-block-style`, |
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`border-block-start-style`, `border-block-end-style`, `border-inline-style`, |
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`border-inline-start-style`, `border-inline-end-style`, `border-start-style`, |
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`border-end-style`, `border-width`, `border-block-width`, |
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`border-block-start-width`, `border-block-end-width`, `border-inline-width`, |
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`border-inline-start-width`, `border-inline-end-width`, `border-start-width`, |
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`border-end-width`, `border-start-start-radius`, `border-start-end-radius`, |
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`border-end-start-radius`, `border-end-end-radius` |
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#### Logical Offsets |
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- `inset`, `inset-block`, `inset-block-start`, `inset-block-end`, |
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`inset-inline`, `inset-inline-start`, `inset-inline-end`, `inset-start`, |
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`inset-end` |
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#### Logical Margins |
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- `margin`, `margin-block`, `margin-block-start`, `margin-block-end`, |
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`margin-inline`, `margin-inline-start`, `margin-inline-end`, `margin-start`, |
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`margin-end` |
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#### Logical Paddings |
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- `padding`, `padding-block`, `padding-block-start`, `padding-block-end`, |
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`padding-inline`, `padding-inline-start`, `padding-inline-end`, |
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`padding-start`, `padding-end` |
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#### Logical Sizes |
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- `block-size`, `max-block-size`, `min-block-size`, `inline-size`, `max-inline-size`, `min-inline-size` |
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#### Flow-Relative Values |
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- `clear: inline-start`, `clear: inline-end`, `float: inline-start`, |
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`float: inline-end`, `text-align: start`, `text-align: end` |
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--- |
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By default, [PostCSS Logical Properties and Values] creates fallback selectors |
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which require at least one `[dir]` attribute in your HTML. If you don’t have |
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any `[dir]` attributes, consider using the following JavaScript: |
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```js |
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// force at least one dir attribute (this can run at any time) |
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document.documentElement.dir = document.documentElement.dir || 'ltr'; |
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``` |
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Otherwise, consider using the `dir` option to transform all logical properties |
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and values to a specific direction. |
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```js |
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require('postcss-logical')({ |
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dir: 'ltr' |
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}); |
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``` |
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## Usage |
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Add [PostCSS Logical Properties and Values] to your project: |
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```bash |
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npm install postcss-logical --save-dev |
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``` |
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Use [PostCSS Logical Properties and Values] as a [PostCSS] plugin: |
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```js |
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const postcss = require('postcss'); |
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const postcssLogical = require('postcss-logical'); |
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postcss([ |
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postcssLogical(/* pluginOptions */) |
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]).process(YOUR_CSS /*, processOptions */); |
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``` |
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[PostCSS Logical Properties and Values] runs in all Node environments, with |
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special instructions for: |
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| [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) | |
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## Options |
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### dir |
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The `dir` option determines how directional fallbacks should be added to CSS. |
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By default, fallbacks replace the logical declaration with nested `:dir` |
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pseudo-classes. If `dir` is defined as `ltr` or `rtl` then only the left or |
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right directional fallbacks will replace the logical declarations. If |
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`preserve` is defined as `true`, then the `dir` option will be ignored. |
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### preserve |
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The `preserve` option determines whether directional fallbacks should be added |
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before logical declarations without replacing them. By default, directional |
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fallbacks replace logical declaration. If `preserve` is defined as `true`, then |
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the `dir` option will be ignored. |
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## :dir() pseudo class |
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This plugin transforms using the `:dir(ltr)` pseudo class. |
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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"]`. |
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Currently `:dir(ltr)` doesn't have great browser support but this will improve over time. |
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[css-img]: https://cssdb.org/images/badges/logical-properties-and-values.svg |
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[css-url]: https://cssdb.org/#logical-properties-and-values |
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[cli-img]: https://github.com/csstools/postcss-plugins/workflows/test/badge.svg |
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[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test |
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[discord]: https://discord.gg/bUadyRwkJS |
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[npm-img]: https://img.shields.io/npm/v/postcss-logical.svg |
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[npm-url]: https://www.npmjs.com/package/postcss-logical |
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[CSS Logical Properties and Values]: https://drafts.csswg.org/css-logical/ |
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[Gulp PostCSS]: https://github.com/postcss/gulp-postcss |
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[Grunt PostCSS]: https://github.com/nDmitry/grunt-postcss |
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[PostCSS]: https://github.com/postcss/postcss |
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[PostCSS Loader]: https://github.com/postcss/postcss-loader |
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[PostCSS Logical Properties and Values]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-logical
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