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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.normal {font-weight:normal;} p.light {font-weight:lighter;} p.thick {font-weight:bold;} p.thicker {font-weight:900;} </style> <p class="normal">This is a paragraph.</p> <p class="light">This is a paragraph.</p> <p class="thick">This is a paragraph.</p> <p class="thicker">This is a paragraph.</p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：