App下載
實例代碼( Tip: 登錄后體驗更佳 )
<!DOCTYPE html>
<html>
<head>
<style>
    a:after {content: " (" attr(href) ")";}
</style>
</head>
<body>
    <p><a href="http://www.w3cschool.cn">w3cschool</a> 包含免费的教程和参考.</p>
    <p><b>请注意:</b> 只有在指定了!DOCTYPE的情况下，IE8才支持content属性.</p>
</body>
</html>
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運行結果