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<!DOCTYPE html> <html> <head> <style> #myDIV { position: absolute; width: 100px; height: 100px; background-color: coral; color: white; top: 0; animation: mymove 5s infinite; } @keyframes mymove { 50% {top: 300px;} } </style> </head> <body> <h1>顶部动画</h1> <p>逐渐将 top 属性从 0 更改为 300px，然后再回到 0：<p> <div id="myDIV"> <h1>myDIV</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>