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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<html>
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<body>
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Here comes a long quotation:
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<blockquote>
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This is a long quotation. This is a long quotation. This is a long quotation. This is a long quotation. This is a long quotation.
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</blockquote>
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请注意,浏览器在 blockquote 元素前后添加了换行,并增加了外边距。
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</body>
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</html>
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