如何指定一组CSS规则的目标媒体类型
Link元素上的media属性指定外部样式表的目标媒体-
示例
<style>
<!--
<!doctype html public "-//w3c//dtd html 4.0//en">
<html>
<head>
<title>link to a target medium</title>
<link rel="stylesheet" type="text/css" media="print, handheld" href="foo.css">
</head>
<body>
<p>the body...
</body>
</html>
-->
</style>