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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 120px; background-color: coral; color: white; animation: mymove 5s infinite; } @keyframes mymove { 50% {width: 500px;} } </style> </head> <body> <h1>宽度动画</h1> <p>逐渐将 DIV 元素的宽度从 120px 更改为 500px，然后再更改回 120px：<p> <div id="myDIV"> <h1>My DIV</h1> </div> <p><strong>注意：</strong>CSS 动画在 Internet Explorer 9 及更早版本中不起作用。</p> </body> </html>