I've implemented a WebM video with the video tag. The alpha channel is displayed correctly in Chrome but not in Firefox nor Edge - there's a black background.
I thought those browsers had good support for WebM? Am I missing something?
Markup looks like this:
<video autoplay loop muted poster="example.jpg">
<source src="video.webm" type="video/webm">
</video>
Thanks in advance! :)
//EDIT I got alpha channel working with Firefox: Used VP8 instead of VP9 codec. Edge is still a mystery.