<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
<style>
li:first-child
{
background:yellow;
}
</style>
</head>
<body>
<ul>
<li>Coffee</li>
<li>Tea</li>
<li>Coca Cola</li>
</ul>
<ol>
<li>Coffee</li>
<li>Tea</li>
<li>Coca Cola</li>
</ol>
<p><b>注意:</b> :first-child作用于IE8以及更早版本的浏览器, DOCTYPE必须已经声明</p>
</body>
</html>
