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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> .dropdown { position: relative; display: inline-block; } .dropdown-content { display: none; position: absolute; background-color: #f9f9f9; min-width: 160px; box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2); padding: 12px 16px; } .dropdown:hover .dropdown-content { display: block; } </style> <h2>鼠标移动后出现下拉菜单</h2> <p>将鼠标移动到指定元素上就能看到下拉菜单。</p> <div class="dropdown"> <span>鼠标移动到我这！</span> <div class="dropdown-content"> <p>简单教程</p> <p>www.twle.cn</p> </div> </div> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
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