I mean in terms of video containers, webm is a video container made by the same or adjacent team that made webp. The only other video container I’ve seen that supports transparency is HEVC, which only works in safari.
Transparency is the only reason I’d ever use webm, just to clarify.



This. I had an issue a couple months ago. I posted on the distro’s form with a much info as I could provide and some real smart people gave me a ton of help really quickly.
Knowing how to ask and not being abrasive is really helpful.