<audio>
and <video>
tags without Javascript.video/mp4;%20codecs=%22avc1.4d401f%22
<video preload="auto" controls="controls" autoplay="autoplay">
<source src="https://ftp.nluug.nl/pub/graphics/blender/demo/movies/ToS/tears_of_steel_720p.mov" type='video/mp4;%20codecs=%22avc1.4d401f%22'>
</video>
HTMLMediaElement.canPlayType('video/mp4;%20codecs=%22avc1.4d401f%22')
→ MediaSource.isTypeSupported('video/mp4;%20codecs=%22avc1.4d401f%22')
→