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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; border: 1px solid black; background-image: url('smiley.gif'); background-position: top left; animation: mymove 5s infinite; } @keyframes mymove { 50% {background-position: center;} } </style> </head> <body> <h1>背景位置动画</h1> <p>逐渐将背景位置 background-position 从"top left"更改为"center"，然后再变回"top left"：<p> <div id="myDIV"></div> <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>