199 lines
6.1 KiB
Markdown
199 lines
6.1 KiB
Markdown
# 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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[![Support Chat][git-img]][git-url]
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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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```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; padding-right: 40px;
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}
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.banner:dir(rtl) {
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padding-right: 20px; padding-left: 40px;
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}
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.banner {
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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; left: 5px; bottom: 10px; right: 5px;
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padding-left: 20px; 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; padding-right: 40px;
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}
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.banner:dir(rtl) {
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padding-right: 20px; padding-left: 40px;
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}
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.banner {
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color: #222222;
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top: 0; left: 5px; bottom: 10px; right: 5px;
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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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resize: vertical;
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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`
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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`, `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] to process your CSS:
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```js
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const postcssLogical = require('postcss-logical');
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postcssLogical.process(YOUR_CSS /*, processOptions, pluginOptions */);
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```
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Or use it 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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| --- | --- | --- | --- | --- | --- |
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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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[css-img]: https://cssdb.org/badge/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://img.shields.io/travis/jonathantneal/postcss-logical.svg
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[cli-url]: https://travis-ci.org/jonathantneal/postcss-logical
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[git-img]: https://img.shields.io/badge/support-chat-blue.svg
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[git-url]: https://gitter.im/postcss/postcss
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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/jonathantneal/postcss-logical
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