<audio>
and <video>
tags without Javascript.video/x-msvideo
<video preload="auto" controls="controls" autoplay="autoplay">
<source src="https://ossguy.com/sita/Sita_Sings_the_Blues_640x360_XviD.avi" type='video/x-msvideo'>
</video>
HTMLMediaElement.canPlayType('video/x-msvideo')
→ MediaSource.isTypeSupported('video/x-msvideo')
→