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<!DOCTYPE html> <html> <head> <style> #myDIV { margin: auto; border: 1px solid black; outline: coral solid 5px; width: 300px; height: 300px; animation: mymove 5s infinite; } @keyframes mymove { 50% {outline-width: 50px;} } </style> </head> <body> <h1>轮廓宽度的动画</h1> <p>逐渐将 outline-width 属性从 5px 更改为 50px，然后再更改回 5px：<p> <div id="myDIV"></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>