代码编辑器：
x
1
2
<meta charset="utf-8">3
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 4
<style> 5
p:nth-last-child(2)6
{7
background:#ff0000;8
}9
</style>10
11
<p>The first paragraph.</p>12
<p>The second paragraph.</p>13
<p>The third paragraph.</p>14
<p>The fourth paragraph.</p>15
16
<p><b>注意:</b> Internet Explorer 8 以及更早版本的浏览器不支持:nth-last-child()选择器.</p>17
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