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<!DOCTYPE html> <html> <head> <style> #myDIV { background-color: lightblue; border: 1px solid black; animation: mymove 5s infinite; } @keyframes mymove { 50% {padding-top: 50px;} } </style> </head> <body> <h1>padding-top 的动画效果：</h1> <p>逐渐将上内边距从 0px 改为 50px，然后再改回 0px：<p> <div id="myDIV"> Shanghai is one of the four direct-administered municipalities of the People's Republic of China. Welcome to Shanghai! ... </div> <p><b>注释：</b>CSS 动画在 Internet Explorer 9 以及更早版本中不起作用。</p> </body> </html>