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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; outline: 1px solid black; animation: mymove 5s infinite; } @keyframes mymove { 50% {outline: 15px solid lightblue;} } </style> </head> <body> <h1>轮廓动画</h1> <p>逐渐改变轮廓属性：<p> <div id="myDIV"></div> <p>outline 属性是所有 outline 属性的简写属性。</p> <p>查看各个 outline 轮廓属性以了解哪些是<em>动画</em>。</p> <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>