<html>
<head>
<style>
div {
width: 100px;
height: 100px;
background: red;
position: relative;
animation: myfirst 5s 2;
animation-direction: alternate-reverse;
}
@keyframes myfirst {
0% {background: red; left: 0px; top: 0px;}
25% {background: yellow; left: 200px; top: 0px;}
50% {background: blue; left: 200px; top: 200px;}
75% {background: green; left: 0px; top: 200px;}
100% {background: red; left: 0px; top: 0px;}
}
</style>
</head>
<body>
<p>Play the animation backwards first, then forwards:</p>
<div></div>
<p><strong>Note:</strong> The animation-direction property is not supported in Internet Explorer 9 and earlier versions.</p>
</body>
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</html>