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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background: red; position: relative; animation: mymove 5s infinite; } @keyframes mymove { 0% {top: 0px; background: red; width: 100px;} 100% {top: 200px; background: yellow; width: 300px;} } </style> </head> <body> <h1>@keyframes 规则</h1> <p><strong>注意：</strong>@keyframes 规则在 Internet Explorer 9 及更早版本中不受支持。</p> <div></div> </body> </html>