trycss_sel_firstchild 在线代码实例

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
<style>
p:first-child
{
    background-color:yellow;
}
</style>
</head>
<body>
<p>This paragraph is the first child of its parent (body).</p>
<h1>Welcome to My Homepage</h1>
<p>This paragraph is not the first child of its parent.</p>
<div>
<p>This paragraph is the first child of its parent (div).</p>
<p>This paragraph is not the first child of its parent.</p>
</div>
<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>
 
 
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运行结果
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