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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> #myDIV { width: 500px; background-color: lightblue; overflow: auto; border: 1px solid black; -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */ animation: mymove 5s infinite; } /* Chrome, Safari, Opera */ @-webkit-keyframes mymove { 50% {min-height: 400px;} } /* Standard syntax */ @keyframes mymove { 50% {min-height: 400px;} } </style> <p>逐步改变 max-height, 从 "none" 到 "400px":<p> <div id="myDIV"> <p>This DIV element does not have a pre-defined height.</p> <p>An animation will change the min-height, from "none" to "400px".</p> </div> <p>min-height 属性支持动画效果。</p> <p><b>注意：</b>Internet Explorer 9 及更早 IE 版本不支持 CSS 动画。</p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
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