嵌套的 css 规则
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nested css rules
提问by M4N
Some time ago I saw an example of a css file, where the css rules/selectors where specified in a nested way, e.g. something like this:
前段时间我看到了一个 css 文件的例子，其中 css 规则/选择器以嵌套方式指定，例如这样的：
div.a {
color: red;
div.b {
font-weight: bold;
}
}
I'm not sure where I saw that (probably in a SO question), or whether it was exactly as shown above.
我不确定我在哪里看到的（可能是在一个 SO 问题中），或者它是否完全如上所示。
My questions: Is the above CSS correct/valid? Is it a standard way to specify CSS rules or is this a browser-dependent hack?
我的问题：上述 CSS 是否正确/有效？这是指定 CSS 规则的标准方法还是依赖于浏览器的 hack？
回答by BoltClock
That is not valid standard CSS, but it's an example of nesting class declarations using Sass/SCSSor LESSand I believe other CSS extensions out there, which expand it to something like this (which is valid CSS), before serving it to the browser to use:
这不是有效的标准 CSS，但它是使用Sass/SCSS或LESS嵌套类声明的一个例子，我相信其他 CSS 扩展在那里，在将它提供给浏览器之前将它扩展为这样的东西（这是有效的 CSS）使用：
div.a {
color: red;
}
div.a div.b {
/* Inherits color from div.a */
font-weight: bold;
}
回答by HoLyVieR
回答by meder omuraliev
You can nest rules with SASS, http://sass-lang.com/
你可以用 SASS 嵌套规则，http://sass-lang.com/
Maybe that was it?
也许就是这样？
回答by balupton
Seems there is a proposal over at https://tabatkins.github.io/specs/css-nesting/
似乎有一个提案在https://tabatkins.github.io/specs/css-nesting/
but I can't find the status of it
但我找不到它的状态
