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代码编辑器：
<!DOCTYPE html> <meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> <style> ul { list-style-type: none; } ul li a { color: green; text-decoration: none; padding: 3px; display: block; } @media screen and (max-width: 699px) and (min-width: 520px) { ul li a { padding-left: 30px; background: url(email-icon.png) left center no-repeat; } } </style> <h1>重置浏览器窗口，查看效果!</h1> <ul> <li><a data-email="johndoe@example.com" href="mailto:johndoe@example.com">John Doe</a></li> <li><a data-email="marymoe@example.com" href="mailto:marymoe@example.com">Mary Moe</a></li> <li><a data-email="amandapanda@example.com" href="mailto:amandapanda@example.com">Amanda Panda</a></li> </ul> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：