<audio>
and <video>
tags without Javascript.video/mp4; codecs="avc1.4d001f,mp4a.40.2"
<video preload="auto" controls="controls" autoplay="autoplay">
<source src="https://www.mainconcept.com/fileadmin/user_upload/products/Source_out.mp4" type='video/mp4; codecs="avc1.4d001f,mp4a.40.2"'>
</video>
HTMLMediaElement.canPlayType('video/mp4; codecs="avc1.4d001f,mp4a.40.2"')
→ MediaSource.isTypeSupported('video/mp4; codecs="avc1.4d001f,mp4a.40.2"')
→