<!DOCTYPE html>
<html>
<head>
<style>
p {
margin: 30px;
border: 1px solid black;
outline: 1px solid red;
outline-offset: 15px;
}
</style>
</head>
<body>
<h1>outline-offset 属性</h1>
<p>本段落在边框边缘外 15 像素处有一条轮廓线。</p>
</body>
</html>