案例：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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​
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<video width="320" height="240" controls="controls">
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  <source src="/img/movie.ogg" type="video/ogg">
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  <source src="/img/movie.mp4" type="video/mp4">
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Your browser does not support the video tag.
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</video>
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​
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</body>
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</html>
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​