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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 100px; height: 100px; background-color: coral; color: white; animation: mymove 5s infinite; } @keyframes mymove { 50% {box-shadow: 10px 20px 30px blue;} } </style> </head> <body> <h1>box-shadow 动画</h1> <p>逐渐改变 box-shadow 属性：<p> <div id="myDIV"> <h1>myDIV</h1> </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>