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源代码：
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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; border: 1px solid black; background-image: url('/statics/images/course/smiley.gif'); background-size: 20px 20px; -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */ animation: mymove 5s infinite; } /* Chrome, Safari, Opera */ @-webkit-keyframes mymove { 50% {background-size: 125px 125px;} } /* Standard syntax */ @keyframes mymove { 50% {background-size: 125px 125px;} } </style> </head> <body> <p>逐步改变 background-size 属性，从 "10px 10px" 到 "125px 125px",然后回到 "10px 10px":<p> <div id="myDIV"></div> <p>background-size 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> </body> </html>
运行结果
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