<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title</title>
<style>
div
{
width:100px;
height:100px;
background:red;
transition:width 2s;
}
div:hover
{
width:300px;
}
</style>
</head>
<body>
<p><b>注意：</b>该实例无法在 Internet Explorer 9 及更早 IE 版本上工作。</p>
<div></div>
<p>鼠标移动到 div 元素上，查看过渡效果。</p>
</body>
</html>
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