outline
Overview
UK[ˈaʊtlaɪn] US[ˈaʊtˌlaɪn]
offset
Offset
UK[ˈɒfset] US[ˈɔ:fset]
css outline-offset property syntax
How to use the outline-offset attribute?
Theoutline-offset property sets the distance between the outline and the edge of the border. Basic syntax: outline-offset:length; indicates that the distance between the outline and the border is length. The unit of length can be an absolute unit (such as px) or a relative unit (such as %).
Function: The outline-offset property offsets the outline and draws it on the edge of the border. Outlines differ from borders in two ways: outlines take up no space, and outlines may be non-rectangular.
Syntax: outline-offset: length|inherit;
Description: length Outline and border edge distance. Inherit specifies that the value of the outline-offset attribute should be inherited from the parent element.
Note: All major browsers support the outline-offset attribute, except Internet Explorer.
css outline-offset property example
<!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>
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