mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-25 09:55:15 +00:00
100 lines
2.5 KiB
Markdown
100 lines
2.5 KiB
Markdown
|
# CSS Has Pseudo [<img src="http://jonathantneal.github.io/js-logo.svg" alt="" width="90" height="90" align="right">][CSS Has Pseudo]
|
|||
|
|
|||
|
[![NPM Version][npm-img]][npm-url]
|
|||
|
[![Build Status][cli-img]][cli-url]
|
|||
|
[![Support Chat][git-img]][git-url]
|
|||
|
|
|||
|
[CSS Has Pseudo] lets you style elements relative to other elements in CSS,
|
|||
|
following the [Selectors Level 4] specification.
|
|||
|
|
|||
|
```css
|
|||
|
a:has(> img) {
|
|||
|
/* style links that contain an image */
|
|||
|
}
|
|||
|
|
|||
|
h1:has(+ p) {
|
|||
|
/* style level 1 headings that are followed by a paragraph */
|
|||
|
}
|
|||
|
|
|||
|
section:not(:has(h1, h2, h3, h4, h5, h6)) {
|
|||
|
/* style sections that don’t contain any heading elements */
|
|||
|
}
|
|||
|
|
|||
|
body:has(:focus) {
|
|||
|
/* style the body if it contains a focused element */
|
|||
|
}
|
|||
|
```
|
|||
|
|
|||
|
## Usage
|
|||
|
|
|||
|
From the command line, transform CSS files that use `:has` selectors:
|
|||
|
|
|||
|
```bash
|
|||
|
npx css-has-pseudo SOURCE.css TRANSFORMED.css
|
|||
|
```
|
|||
|
|
|||
|
Next, use your transformed CSS with this script:
|
|||
|
|
|||
|
```html
|
|||
|
<link rel="stylesheet" href="TRANSFORMED.css">
|
|||
|
<script src="https://unpkg.com/css-has-pseudo/browser"></script>
|
|||
|
<script>cssHasPseudo(document)</script>
|
|||
|
```
|
|||
|
|
|||
|
That’s it. The script is 765 bytes and works in all browsers, including
|
|||
|
Internet Explorer 11. With a [Mutation Observer polyfill], the script will work
|
|||
|
down to Internet Explorer 9.
|
|||
|
|
|||
|
## How it works
|
|||
|
|
|||
|
The [PostCSS plugin](README-POSTCSS.md) clones rules containing `:has`,
|
|||
|
replacing them with an alternative `[:has]` selector.
|
|||
|
|
|||
|
```css
|
|||
|
body:has(:focus) {
|
|||
|
background-color: yellow;
|
|||
|
}
|
|||
|
|
|||
|
section:not(:has(h1, h2, h3, h4, h5, h6)) {
|
|||
|
background-color: gray;
|
|||
|
}
|
|||
|
|
|||
|
/* becomes */
|
|||
|
|
|||
|
body[\:has\(\:focus\)] {
|
|||
|
background-color: yellow;
|
|||
|
}
|
|||
|
|
|||
|
body:has(:focus) {
|
|||
|
background-color: yellow;
|
|||
|
}
|
|||
|
|
|||
|
section[\:not-has\(h1\,\%20h2\,\%20h3\,\%20h4\,\%20h5\,\%20h6\)] {
|
|||
|
background-color: gray;
|
|||
|
}
|
|||
|
|
|||
|
section:not(:has(h1, h2, h3, h4, h5, h6)) {
|
|||
|
background-color: gray;
|
|||
|
}
|
|||
|
```
|
|||
|
|
|||
|
Next, the [JavaScript library](README-BROWSER.md) adds a `[:has]` attribute to
|
|||
|
elements otherwise matching `:has` natively.
|
|||
|
|
|||
|
```html
|
|||
|
<body :has(:focus)>
|
|||
|
<input value="This element is focused">
|
|||
|
</body>
|
|||
|
```
|
|||
|
|
|||
|
[cli-img]: https://img.shields.io/travis/csstools/css-has-pseudo/master.svg
|
|||
|
[cli-url]: https://travis-ci.org/csstools/css-has-pseudo
|
|||
|
[git-img]: https://img.shields.io/badge/support-chat-blue.svg
|
|||
|
[git-url]: https://gitter.im/postcss/postcss
|
|||
|
[npm-img]: https://img.shields.io/npm/v/css-has-pseudo.svg
|
|||
|
[npm-url]: https://www.npmjs.com/package/css-has-pseudo
|
|||
|
|
|||
|
[CSS Has Pseudo]: https://github.com/csstools/css-has-pseudo
|
|||
|
[Mutation Observer polyfill]: https://github.com/webmodules/mutation-observer
|
|||
|
[Selectors Level 4]: https://drafts.csswg.org/selectors-4/#has-pseudo
|