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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​
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<video width="320" height="240" poster="/img/w3xue_logo_white.jpg" controls>
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   <source src="/img/movie.mp4" type="video/mp4">
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   <source src="/img/movie.ogg" type="video/ogg">
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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>