<audio>
and <video>
tags without Javascript.audio/flac
<audio preload="auto" controls="controls" autoplay="autoplay">
<source src="https://hpr.dogphilosophy.net/test/flac.flac" type='audio/flac'>
</audio>
HTMLMediaElement.canPlayType('audio/flac')
→ MediaSource.isTypeSupported('audio/flac')
→