<audio>
and <video>
tags without Javascript.video/ogg; codecs="theora, vorbis"
<video preload="auto" controls="controls" autoplay="autoplay">
<source src="https://upload.wikimedia.org/wikipedia/commons/b/b3/Big_Buck_Bunny_Trailer_400p.ogv" type='video/ogg; codecs="theora, vorbis"'>
</video>
HTMLMediaElement.canPlayType('video/ogg; codecs="theora, vorbis"')
→ MediaSource.isTypeSupported('video/ogg; codecs="theora, vorbis"')
→