mytest | 码农工具

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(runcodex.com)</title> 
<style> 
p:nth-child(2)
{
    background:#ff0000;
}
</style>
</head>
<body>
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<h1>This is a heading</h1>
<h1>This is a heading</h1>
<p>The first paragraph.</p>
<p>The second paragraph.</p>
<p>The third paragraph.</p>
<p>The fourth paragraph.</p>
​
<p><b>注意:</b> Internet Explorer 8 以及更早版本的浏览器不支持 :nth-child()选择器.</p>
​
</body>
</html>
HTML