<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/d/d0/Caminandes-_Llama_Drama_-_Short_Movie.ogv" type='video/ogg; codecs="theora,vorbis"'>
</video>
HTMLMediaElement.canPlayType('video/ogg; codecs="theora,vorbis"')
→ MediaSource.isTypeSupported('video/ogg; codecs="theora,vorbis"')
→