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代码编辑器：
<!DOCTYPE html> <meta charset="utf-8"> <style> body {background-color:yellow;} h1 {font-size:36pt;} h2 {color:blue;} p {margin-left:50px;} </style> <h1>This header is 36 pt</h1> <h2>This header is blue</h2> <p>This paragraph has a left margin of 50 pixels</p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：