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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: 300px; height: 200px; border: 1px solid black; background-image: url('/static/i/css/smiley.gif'); background-position: top left; -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */ animation: mymove 5s infinite; } /* Chrome, Safari, Opera */ @-webkit-keyframes mymove { 50% {background-position: center;} } /* Standard syntax */ @keyframes mymove { 50% {background-position: center;} } </style> <p>逐步改变 background-position 属性，从 "top left" 到 "center",然后回到 "top left":<p> <div id="myDIV"></div> <p>background-position 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>
运行结果：