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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>
 
<style>
#example1 {
    border: 10px dotted black;
    padding:35px;
    background: yellow;
}

#example2 {
    border: 10px dotted black;
    padding:35px;
    background: yellow;
    background-clip: padding-box;
}

#example3 {
    border: 10px dotted black;
    padding:35px;
    background: yellow;
    background-clip: content-box;
}
</style>

<p>没有背景剪裁 (border-box没有定义):</p>
<div id="example1">
<h2>Lorem Ipsum Dolor</h2>
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</p>
</div>
<p>background-clip: padding-box:</p>
<div id="example2">
<h2>Lorem Ipsum Dolor</h2>
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</p>
</div>
<p>background-clip: content-box:</p>
<div id="example3">
<h2>Lorem Ipsum Dolor</h2>
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</p>
</div>
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代码编辑器：

运行结果：