mirror of https://github.com/actions/setup-python
70 lines
2.1 KiB
Plaintext
70 lines
2.1 KiB
Plaintext
|
# CSSOM
|
|||
|
|
|
|||
|
|
CSSOM.js is a CSS parser written in pure JavaScript. It also a partial implementation of [CSS Object Model](http://dev.w3.org/csswg/cssom/).
|
|||
|
|
|
|||
|
|
CSSOM.parse("body {color: black}")
|
|||
|
|
-> {
|
|||
|
|
cssRules: [
|
|||
|
|
{
|
|||
|
|
selectorText: "body",
|
|||
|
|
style: {
|
|||
|
|
0: "color",
|
|||
|
|
color: "black",
|
|||
|
|
length: 1
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
]
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
## [Parser demo](http://nv.github.com/CSSOM/docs/parse.html)
|
|||
|
|
|
|||
|
|
Works well in Google Chrome 6+, Safari 5+, Firefox 3.6+, Opera 10.63+.
|
|||
|
|
Doesn't work in IE < 9 because of unsupported getters/setters.
|
|||
|
|
|
|||
|
|
To use CSSOM.js in the browser you might want to build a one-file version that exposes CSSOM global variable:
|
|||
|
|
|
|||
|
|
➤ git clone https://github.com/NV/CSSOM.git
|
|||
|
|
➤ cd CSSOM
|
|||
|
|
➤ npm install -d
|
|||
|
|
➤ ./node_modules/.bin/jake
|
|||
|
|
build/CSSOM.js is done
|
|||
|
|
|
|||
|
|
To use it with Node.js or any other CommonJS loader:
|
|||
|
|
|
|||
|
|
➤ npm install cssom
|
|||
|
|
|
|||
|
|
## Don’t use it if...
|
|||
|
|
|
|||
|
|
You parse CSS to mungle, minify or reformat the following code:
|
|||
|
|
|
|||
|
|
```css
|
|||
|
|
div {
|
|||
|
|
background: gray;
|
|||
|
|
background: linear-gradient(to bottom, white 0%, black 100%);
|
|||
|
|
}
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
This pattern is often used to give browsers that don’t understand linear gradients a fallback solution (e.g. gray color in the example).
|
|||
|
|
In CSSOM, `background: gray` [gets overwritten](http://nv.github.io/CSSOM/docs/parse.html#css=div%20%7B%0A%20%20%20%20%20%20background%3A%20gray%3B%0A%20%20%20%20background%3A%20linear-gradient(to%20bottom%2C%20white%200%25%2C%20black%20100%25)%3B%0A%7D).
|
|||
|
|
The last same-name property always overwrites all the previous ones.
|
|||
|
|
|
|||
|
|
|
|||
|
|
If you do CSS mungling, minification, image inlining, and such, CSSOM.js is no good for you, considere using one of the following:
|
|||
|
|
|
|||
|
|
* [postcss](https://github.com/postcss/postcss)
|
|||
|
|
* [reworkcss/css](https://github.com/reworkcss/css)
|
|||
|
|
* [csso](https://github.com/css/csso)
|
|||
|
|
* [mensch](https://github.com/brettstimmerman/mensch)
|
|||
|
|
|
|||
|
|
|
|||
|
|
## [Specs](http://nv.github.com/CSSOM/spec/)
|
|||
|
|
|
|||
|
|
To run specs locally:
|
|||
|
|
|
|||
|
|
➤ git submodule init
|
|||
|
|
➤ git submodule update
|
|||
|
|
|
|||
|
|
|
|||
|
|
## [Who uses CSSOM.js](https://github.com/NV/CSSOM/wiki/Who-uses-CSSOM.js)
|