实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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div
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{
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width:100px;
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height:100px;
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background:red;
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position:relative;
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animation:myfirst 5s linear 2s infinite alternate;
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/* Firefox: */
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-moz-animation:myfirst 5s linear 2s infinite alternate;
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/* Safari and Chrome: */
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-webkit-animation:myfirst 5s linear 2s infinite alternate;
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/* Opera: */
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-o-animation:myfirst 5s linear 2s infinite alternate;
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}
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​
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@keyframes myfirst
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{
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0%   {background:red; left:0px; top:0px;}