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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 {font-size:250%;} h2 {font-size:200%;} p {font-size:100%;} </style> <h1>This is heading 1</h1> <h2>This is heading 2</h2> <p>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：