width:100px;
height:100px;
background:yellow;
transition:width 2s;
div:hover
{
width:300px;
}
<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:100px;
height:100px;
background:yellow;
transition:width 2s, height 2s;
-moz-transition:width 2s, height 2s, -moz-transform 2s;
-webkit-transition:width 2s, height 2s, -webkit-transform 2s; /* Safari and Chrome */
-o-transition:width 2s, height 2s, -o-transform 2s;
}
div:hover
{
width:200px;
height:200px;
transform:rotate(180deg);
-moz-transform:rotate(180deg);
-webkit-transform:rotate(180deg); /* Safari and Chrome */
-o-transform:rotate(180deg);
}
</style>
</head>
<body>
<div>请把鼠标指针放到黄色的 div 元素上，来查看过渡效果。</div>
<p><b>注释：</b>本例在 Internet Explorer 中无效。</p>
</body>
</html>
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