案例:html/html5 案例     状态:可编辑再运行    进入竖版
 运行结果 
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<!DOCTYPE HTML>
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<html>
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<body>
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<header>
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<h1>Welcome to my homepage</h1>
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<p>My name is Donald Duck</p>
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</header>
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<p>The rest of my home page...</p>
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</body>
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</html>
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