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代码编辑器：
<!DOCTYPE html> <meta charset="utf-8"> <style> body {background-color:tan;} h1 {color:maroon;font-size:20pt;} hr {color:navy;} p {font-size:11pt;margin-left:15px;} a:link {color:green;} a:visited {color:yellow;} a:hover {color:black;} a:active {color:blue;} </style> <h1>This is a header 1</h1> <hr> <p>You can see that the style sheet formats the text</p> <p><a href="https://www.twle.cn" target="_blank">This is a link</a></p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：