Uses the equivalent to this FFmpeg command:
ffmpeg -i "DESKCHAN.gif" -c:v libvpx -qmin 0 -qmax 18 -crf 9 -b:v 1400K -quality good -cpu-used 0 -auto-alt-ref 0 -pix_fmt yuva420p -an -sn -vsync cfr "DESKCHAN.webm"
Some really lazy experiments I did with Babylon.js and Three.js to make sure the transparent WebM textures would work and generally be performant. Would not use these as reference since these are just meant to be quick and dirty tests. Sources are linked in the HTML comments.