Comment by porphyra
working with GIF is valid but it is incredibly sad how it's still the only widely supported silent autoplaying video...
(I guess APNG is supported in many browsers, but uploading one often results in deleterious resizing/recompressing operations that ruins the animation. Discord uses APNG and webp for stickers afaik)
APNG and animated WEBP are blocked and/or unsupported practically everywhere I try. And I try a lot of places to test it. Reddit supports neither, yet allows GIFs. It's sad.