mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-22 16:35:14 +00:00
88 lines
2.2 KiB
Markdown
88 lines
2.2 KiB
Markdown
|
# CSS Blank Pseudo [<img src="http://jonathantneal.github.io/js-logo.svg" alt="" width="90" height="90" align="right">][CSS Blank Pseudo]
|
|||
|
|
|
|||
|
|
[![NPM Version][npm-img]][npm-url]
|
|||
|
|
[![Build Status][cli-img]][cli-url]
|
|||
|
|
[![Support Chat][git-img]][git-url]
|
|||
|
|
|
|||
|
|
[CSS Blank Pseudo] lets you style form elements when they are empty, following
|
|||
|
|
the [Selectors Level 4] specification.
|
|||
|
|
|
|||
|
|
```css
|
|||
|
|
input {
|
|||
|
|
/* style an input */
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
input:blank {
|
|||
|
|
/* style an input without a value */
|
|||
|
|
}
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## Usage
|
|||
|
|
|
|||
|
|
From the command line, transform CSS files that use `:blank` selectors:
|
|||
|
|
|
|||
|
|
```bash
|
|||
|
|
npx css-blank-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-blank-pseudo/browser"></script>
|
|||
|
|
<script>cssBlankPseudo(document)</script>
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
That’s it. The script is 509 bytes and works in all browsers.
|
|||
|
|
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
If you support Internet Explorer 11, use the **browser legacy** script, which
|
|||
|
|
is 671 bytes:
|
|||
|
|
|
|||
|
|
```html
|
|||
|
|
<link rel="stylesheet" href="TRANSFORMED.css">
|
|||
|
|
<script src="https://unpkg.com/css-blank-pseudo/browser-legacy"></script>
|
|||
|
|
<script>cssBlankPseudo(document)</script>
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## How it works
|
|||
|
|
|
|||
|
|
The [PostCSS plugin](README-POSTCSS.md) clones rules containing `:blank`,
|
|||
|
|
replacing them with an alternative `[blank]` selector.
|
|||
|
|
|
|||
|
|
```css
|
|||
|
|
input:blank {
|
|||
|
|
background-color: yellow;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* becomes */
|
|||
|
|
|
|||
|
|
input[blank] {
|
|||
|
|
background-color: yellow;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
input:blank {
|
|||
|
|
background-color: yellow;
|
|||
|
|
}
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
Next, the [JavaScript library](README-BROWSER.md) adds a `blank` attribute to
|
|||
|
|
elements otherwise matching `:blank` natively.
|
|||
|
|
|
|||
|
|
```html
|
|||
|
|
<input value="" blank>
|
|||
|
|
<input value="This element has a value">
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
[cli-img]: https://img.shields.io/travis/csstools/css-blank-pseudo/master.svg
|
|||
|
|
[cli-url]: https://travis-ci.org/csstools/css-blank-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-blank-pseudo.svg
|
|||
|
|
[npm-url]: https://www.npmjs.com/package/css-blank-pseudo
|
|||
|
|
|
|||
|
|
[CSS Blank Pseudo]: https://github.com/csstools/css-blank-pseudo
|
|||
|
|
[PostCSS Preset Env]: https://preset-env.cssdb.org/
|
|||
|
|
[Selectors Level 4]: https://drafts.csswg.org/selectors-4/#blank
|