<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:100px;
height:100px;
background:red;
position:absolute;
animation:myfirst 5s;
-webkit-animation:myfirst 5s;
animation-fill-mode: forwards;
}
@-webkit-keyframes myfirst /* Safari and Chrome */
{
0% {background:red; left:500px; bottom:50px;}
25% {background:red; left:500px;height:130px;bottom:50px;}
50% {background:red; left:500px; height:160px;bottom:50px;}
75% {background:red; left:500px;height:190px; bottom:50px;}
100% {background:red; left:500px; height:210px;bottom:50px;}
}
</style>
</head>
<body>
<div></div>
</body>
</html>
原文：http://www.cnblogs.com/yangyang03/p/7771719.html