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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background: red; position: relative; animation: myfirst 5s 2; animation-direction: alternate-reverse; } @keyframes myfirst { 0% {background: red; left: 0px; top: 0px;} 25% {background: yellow; left: 200px; top: 0px;} 50% {background: blue; left: 200px; top: 200px;} 75% {background: green; left: 0px; top: 200px;} 100% {background: red; left: 0px; top: 0px;} } </style> </head> <body> <p>先向后播放动画，然后向前播放：</p> <div></div> <p><strong>注意：</strong> Internet Explorer 9 及更早版本不支持 animation-direction 属性。</p> </body> </html>