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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; outline: 15px solid red; animation: mymove 5s infinite; } @keyframes mymove { 50% {outline-color: blue;} } </style> </head> <body> <h1>轮廓颜色动画</h1> <p>逐渐将 outline-color 属性从红色变为蓝色，然后再变回红色：<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>