I was also thinking that it would be negligible for slideshow gifs, but the iPhone example went from a 1.5MB gif to a 500KB WebM. Using video means you also re

I was also thinking that it would be negligible for slideshow gifs, but the iPhone example went from a 1.5MB gif to a 500KB WebM. Using video means you also remove the 8-bit color restriction that is imposed on gifs. (without hacks, at least)