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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> p:first-child i { background:yellow; } </style> <p>I am a <i>strong</i> man. I am a <i>strong</i> man.</p> <p>I am a <i>strong</i> man. I am a <i>strong</i> man.</p> <p><b>注意:</b> :first-child作用于 IE8以及更早版本的浏览器, DOCTYPE必须已经声明.</p> <footer>简单教程,简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
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