<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:100px;
height:100px;
background:blue;
transition-property:width;
transition-duration:5s;
/* Firefox 4 */
-moz-transition-property:width;
-moz-transition-duration:5s;
/* Safari and Chrome */
-webkit-transition-property:width;
-webkit-transition-duration:5s;
/* Opera */
-o-transition-property:width;
-o-transition-duration:5s;
}
div:hover
{
width:300px;
}
</style>
</head>
<body>
<div></div>
<p>请把鼠标指针移动到蓝色的 div 元素上,就可以看到过渡效果。</p>
<p><b>注释:</b>本例在 Internet Explorer 中无效。</p>
</body>
</html>