<audio>
and <video>
tags without Javascript.video/webm
→ Test this MIME type <video preload="auto" controls="controls" autoplay="autoplay">
<source src="https://upload.wikimedia.org/wikipedia/commons/transcoded/3/36/Cosmos_Laundromat_-_First_Cycle_-_Official_Blender_Foundation_release.webm/Cosmos_Laundromat_-_First_Cycle_-_Official_Blender_Foundation_release.webm.720p.webm">
</video>