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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> p.uppercase {text-transform:uppercase;} p.lowercase {text-transform:lowercase;} p.capitalize {text-transform:capitalize;} </style> <p class="uppercase">This is some text.</p> <p class="lowercase">This is some text.</p> <p class="capitalize">This is some text.</p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
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