<!DOCTYPE html>
<html>
<head>
<style>
div
{
margin:20px;
width:150px;
padding:10px;
height:70px;
border:2px solid black;
outline:2px solid red;
outline-offset:15px;
}
</style>
</head>
<body>
<p><b>注释：</b>Internet Explorer 和 Opera 不支持 support outline-offset 属性。</p>
<div>这个 div 在边框边缘之外 15 像素处有一个轮廓。</div>
</body>
</html>