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代码编辑器：
<!DOCTYPE html> <style> p.hometown { background:yellow; } </style> <p>My name is Donald.</p> <p class="hometown">I live in Ducksburg.</p> <p>My name is Dolly.</p> <p class="hometown">I also live in Ducksburg.</p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
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