<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>css的使用强制优先级</title>
<link rel="stylesheet" type="text/css" href="css/2.css">
<style type="text/css">
h3,p{color: blue!important}
div{border: 2px red solid;padding: 15px;background:blue}
</style>
</head>
<body>
<h3>标题</h3>
<p>只是正文</p>
<div style="color: green">div里面的内容</div>
样式可以叠加，继承，冲突
</body>
</html>
原文：http://www.cnblogs.com/houweidong/p/7535372.html