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（请在下面的文本框中编辑您的代码，然后单击此按钮测试结果。）
编辑您的代码：
<!DOCTYPE html> <html> <head> <style> div { width:100px; height:100px; background:red; animation:myfirst 5s; -moz-animation:myfirst 5s; /* Firefox */ -webkit-animation:myfirst 5s; /* Safari and Chrome */ -o-animation:myfirst 5s; /* Opera */ } @keyframes myfirst { 0% {background:red;} 25% {background:yellow;} 50% {background:blue;} 100% {background:green;} } @-moz-keyframes myfirst /* Firefox */ { 0% {background:red;} 25% {background:yellow;} 50% {background:blue;} 100% {background:green;} } @-webkit-keyframes myfirst /* Safari and Chrome */ { 0% {background:red;} 25% {background:yellow;} 50% {background:blue;} 100% {background:green;} } @-o-keyframes myfirst /* Opera */ { 0% {background:red;} 25% {background:yellow;} 50% {background:blue;} 100% {background:green;} } </style> </head> <body> <div></div> <p><b>注释：</b>当动画完成时，会变回初始的样式。</p> <p><b>注释：</b>本例在 Internet Explorer 中无效。</p> </body> </html>
查看结果: