<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <style type="text/css"> h3{font-size:18px;} .box{border-left:300px solid #222;} .left{width:300px; margin-left:-300px; float:left; } </style></head><body><div class="box"> <nav class="left"> <h3>导航</h3> </nav> <section> <div class="module">模块</div> </section> </div> </body></html>
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