<audio>
and <video>
tags without Javascript.video/3gpp
<video preload="auto" controls="controls" autoplay="autoplay">
<source src="https://www.sample-videos.com/video/3gp/240/big_buck_bunny_240p_1mb.3gp" type='video/3gpp'>
</video>
HTMLMediaElement.canPlayType('video/3gpp')
→ MediaSource.isTypeSupported('video/3gpp')
→