在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<style>a[target]
{
background-color:yellow;
}
</style>
</head>
<body>

<p>The links with a target attribute gets a yellow background:</p>

<a href="http://www.w3cschool.cc">w3cschool.cc</a>
<a href="http://www.disney.com" target="_blank">disney.com</a>
<a href="http://www.wikipedia.org" target="_top">wikipedia.org</a>

<p><b>Note:</b> For [<i>attribute</i>] to work in IE8 and earlier, a DOCTYPE must be declared.</p>
</body>
</html>

源代码

动行结果