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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<head>
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<link rel="icon" href="/img/demo_icon.ico" type="image/gif" sizes="16x16" />
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</head>
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<body>
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<h2>Hello world!</h2>
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<p><a href="/example/html5/demo_html5_link_sizes.html" target="_blank">新窗口</a>打开该页会看到图标。</p>
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</body>
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</html>
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