代码示例:(标识:css_outline)
<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {outline: dashed;}
p.ex2 {outline: dotted red;}
p.ex3 {outline: 5px solid yellow;}
p.ex4 {outline: thick ridge pink;}
</style>
</head>
<body>

<h1>outline 属性</h1>

<p class="ex1">点状轮廓。</p>
<p class="ex2">红色的点状轮廓。</p>
<p class="ex3">5 像素的黄色实线轮廓。</p>
<p class="ex4">粗的粉色凸脊轮廓。</p>

</body>
</html>
运行结果: