案例:html/html5 案例     状态:可编辑再运行    进入竖版
 运行结果 
x
 
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<html>
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<head>
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<style>
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body
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{
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color:red
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}
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</style>
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</head>
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<body>
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<h1>This is a header</h1>
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<p>This is a paragraph</p>
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</body>
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</html>
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