​x
 
<!DOCTYPE html>
<html>
<head>
<style> 
div
{
width:100px;
height:100px;
background:red;
position:relative;
animation:mymove 5s infinite;
-moz-animation:mymove 5s infinite; /* Firefox */
-webkit-animation:mymove 5s infinite; /* Safari and Chrome */
-o-animation:mymove 5s infinite; /* Opera */
}
​
@keyframes mymove
{
0%   {top:0px;}
25%  {top:200px;}
75%  {top:50px}
100% {top:100px;}
}
​
@-moz-keyframes mymove /* Firefox */
{
0%   {top:0px;}
25%  {top:200px;}
75%  {top:50px}
100% {top:100px;}
}
​
@-webkit-keyframes mymove /* Safari and Chrome */
{
0%   {top:0px;}
25%  {top:200px;}
75%  {top:50px}
100% {top:100px;}
}
​
@-o-keyframes mymove /* Opera */
{
0%   {top:0px;}
25%  {top:200px;}
75%  {top:50px}
100% {top:100px;}
}
</style>
</head>
<body>
​
<p><b>注释：</b>本例在 Internet Explorer 中无效。</p>
​
<div></div>
​
</body>
</html>
​