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// <header>
// <aside>
// <footer>
// <article>
// <section>
// <time>
<!-- datatime : -->
<time datatime = "2012-02-28">2/18/2018</time>
// <nav>
// <video>
<video controls autoplay width = "512" height = "288" src = "xxx.mp4">
/** 浏览器兼容 **/
<video controls autoplay width = "512" height = "288">
<source src = "xxx.mp4">
<source src = "xxx.webm">
<!-- 后面两项是可选的 type: 容器格式 codecs:解码器 -->
<source src = "xxx.ogv" type = 'video/ogg'; codecs = "theora,vorbis">
<p> sorry ,cannot play</p>
</video>
// canvas 绘图
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