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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> h1 {text-decoration:overline;} h2 {text-decoration:line-through;} h3 {text-decoration:underline;} </style> <h1>This is heading 1</h1> <h2>This is heading 2</h2> <h3>This is heading 3</h3> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：