In CSS, the usage of before is to insert new content before the element content. You only need to set "element:before{attribute:attribute value;}" to the element. The ":before" selector must use the content attribute to specify the content to be inserted.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
Definition and usage
:The before selector inserts content before the content of the selected element.
Please use the content attribute to specify the content to be inserted.
Example:
<!DOCTYPE html>
<html>
<head>
<style>
p:before
{
content:"台词：";
background-color:yellow;
color:red;
font-weight:bold;
}
</style>
</head>
<body>
<p>我是唐老鸭。</p>
<p>我住在 Duckburg。</p>
</body>
</html>Run result:
Recommended learning:css video tutorial
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