<audio>
and <video>
tags without Javascript.video/mp4
<video preload="auto" controls="controls">
<source src="https://download.blender.org/demo/movies/2.43/prop_random-h264.mov" type='video/mp4'>
</video>
HTMLMediaElement.canPlayType('video/mp4')
→ MediaSource.isTypeSupported('video/mp4')
→