<audio>
and <video>
tags without Javascript.video/mp4
<video preload="auto" controls="controls" autoplay="autoplay">
<source src="https://video.dailymail.co.uk/video/1418450360/2015/02/1418450360_4056782948001_nerdist--1424015378606.mp4" type='video/mp4'>
</video>
HTMLMediaElement.canPlayType('video/mp4')
→ MediaSource.isTypeSupported('video/mp4')
→