Chrome //
Extensions 
Chrome
Web store Download Is Html5 chrome extension. Check if the website supports html5 and install in your Google chrome browser. This is Direct Is Html5 Crx download for Chrome it is also called Is Html5 offline CRX for chrome Download. This Is Html5 is used to Check if the website supports html5
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A HTML5 video speeder
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ニコニコ動画に再生/停止, 巻き戻し, 早送り, コメント入力, その他便利なショートカットキーを追加します
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Disables autoplay of all HTML5 audio and video
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A11Y HTML5 Validator
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Can you change of Speed(0.07-16x)/Loop/Rotate for HTML5 Video(Mouseover/Hold/ContextMenu/DoubleClick).
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Disables autoplay of all HTML5 audio and video
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本扩展基于 flv.js ,用于将直播的 Flash 播放器替换为 html5 播放器。
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A handy reference of HTML5.
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HTML5 Player for Subsonic & Archive.org
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为Acfun替换一个和官方Flash播放器界面高度相仿的HTML5播放器。