>>17: But it's a bitmap format with no compression, and, if I recall correctly, it limits you to only sixteen or so colors...

>>18: Often I'm able to make a smaller GIF than a PNG out of the same image. It might be because PNG is cramming in more metadata, or maybe The GIMP's PNG compressor just sucks.

>>20: That wasn't animated in Safari, but when I tried in Firefox... Good gravy, that's one for the feature request (un-request?) pile.

>>22: I believe Moz used to, but the feature was removed. So, no, no major browser currently does.