在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(cainiaoplay.com)</title>
<style>#myDIV {
    width: 300px;
    height: 200px;
    border: 15px solid black;
    -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */
    animation: mymove 5s infinite;
}

/* Chrome, Safari, Opera */
@-webkit-keyframes mymove {
    50% {border-bottom-color: lightblue;}
}

/* Standard syntax */
@keyframes mymove {
    50% {border-bottom-color: lightblue;}
}
</style>
</head>
<body>
<p>逐步改变 border-bottom-color 属性(黑-蓝-黑):<p>
<div id="myDIV"></div>

<p>border-bottom-color 支持动画。</p>
<p><b>注意：</b>Internet Explorer 9 及更早 IE 版本不支持 CSS 动画。</p>

</body>
</html>
源代码

动行结果
