<audio>
and <video>
tags without Javascript.video/ogg
<video preload="auto" controls="controls" autoplay="autoplay">
<source src="https://d2ezlykacdqcnj.cloudfront.net/using-mouse/using-mouse.ogv" type='video/ogg'>
</video>
HTMLMediaElement.canPlayType('video/ogg')
→ MediaSource.isTypeSupported('video/ogg')
→