<audio>
and <video>
tags without Javascript.video/mp4; codecs="avc1.42c015,mp4a.40.2"
<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; codecs="avc1.42c015,mp4a.40.2"'>
</video>
HTMLMediaElement.canPlayType('video/mp4; codecs="avc1.42c015,mp4a.40.2"')
→ MediaSource.isTypeSupported('video/mp4; codecs="avc1.42c015,mp4a.40.2"')
→