代码编辑器：
x
1
2
<meta charset="utf-8">3
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>4
<style>5
p 6
{7
border-style:solid;8
border-right:thick double #ff0000;9
}10
</style>11
<p>This is some text in a paragraph.</p>12
<footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>13