<!DOCTYPE html>
<html>
<head>
<style>
div {
width: 100px;
height: 100px;
background: red;
-webkit-transition: width 2s, height 4s; /* For Safari 3.1 to 6.0 */
transition: width 2s, height 4s;
}
div:hover {
width: 300px;
height: 300px;
}
</style>
</head>
<body>
<p><b>Note:</b> This example does not work in Internet Explorer 9 and earlier versions.</p>
<div></div>
<p>Hover over the div element above, to see the transition effect.</p>
</body>
</html>