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CSS属性
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CSS3 @media查询
:link
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:before
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选择器.class
选择器#id
选择器*
选择器element
选择器element,element
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选择器[attribute]
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选择器element1~element2
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选择器[attribute*=value]
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:before

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CSS :before 选择器

实例

每个 <p>元素之前插入内容：

p:before
{
content:"Read this: ";
}

定义和说明

:before 选择器向选定的元素前插入内容。

使用content 属性来指定要插入的内容。

浏览器支持

Internet ExplorerFirefoxOperaGoogle ChromeSafari

所有主流浏览器都支持:before选择器。

注意: before在IE8中运行，必须声明 <!DOCTYPE> 。

相关文章

CSS 教程: CSS Pseudo-elements

CSS 选择器参考手册: CSS :after 选择器

实例

在每个<p>之前插入的内容和样式:

p:before
{
content:"Read this -";
background-color:yellow;
color:red;
font-weight:bold;
}
 
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