在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>菜鸟教程(cainiaoplay.com)</title> 
</head>
<body>

<details>
<summary>Copyright 1999-2011.</summary>
<p> - by Refsnes Data. All Rights Reserved.</p>
<p>All content and graphics on this web site are the property of the company Refsnes Data.</p>
</details>

<p><b>注意：</b>目前只有 Chrome 和 Safari 6 支持 summary 标签。</p>

</body>
</html>

源代码

动行结果