<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style type="text/css">
p{
border: 3px green solid;
outline: purple double thick;
}
</style>
</head>
<body>
<p><b>注释：</b>只有在规定了 !DOCTYPE 时，Internet Explorer 8 （以及更高版本） 才支持 outline 属性。</p>
</body>
</html>
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1.outline属性,常用于突出显示;
2.outline-color:设置轮廓颜色;
3.outline-style:设置轮廓样式;
4.outline-width:设置轮廓宽度;
5.简写语法
outline: color style width
运行图片
