How can I insert a gif / video without a background on the site?

Question

JavaScript

I made a website and ran into a problem, the video is inserted with a background, gifs too, I tried the webm file, but nothing helps, has anyone come across this? before there were no tasks to insert such animations, I don’t know what to do

Answer 1

For video without a background, there is so far only a limited implementation, not applicable in real life https://simpl.info/videoalpha/
What is the problem with making the background of the video as the background of a block on the page?