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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; border: 1px solid black; animation: mymove 5s infinite; } @keyframes mymove { 50% {border-right: 15px solid lightblue;} } </style> </head> <body> <h1>border-right 动画</h1> <p>逐渐改变 border-right 属性：<p> <div id="myDIV"></div> <p>border-right 是所有 border-right 属性的简写属性。</p> <p>查看各个右边框属性以查看哪些是<em>动画</em>。</p> <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>