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代码编辑器：
<p>This is a paragraph. This text has no alignment specified.</p> <div style="text-align:center;border:1px solid red"> This is some text in a div element! </div> <p>This is a paragraph. This text has no alignment specified.</p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
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