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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; border: 1px solid black; background-image: url('w3css.gif'); background-size: 20px 20px; animation: mymove 5s infinite; } @keyframes mymove { 50% {background-size: 125px 125px;} } </style> </head> <body> <h1>background-size 背景大小的动画</h1> <p>逐渐将背景大小 background-size 从“10px 10px”更改为“125px 125px”，然后返回：<p> <div id="myDIV"></div> <p><b>注意：</b>CSS 动画在 Internet Explorer 9 和更早版本中不起作用。</p> </body> </html>