Perhaps we could create an RFC for GIF21? The mistake people make in trying to replace GIF is doing too much, turning it into a wholesale replacement. Take GI

Perhaps we could create an RFC for GIF21? The mistake people make in trying to replace GIF is doing too much, turning it into a wholesale replacement. Take GIF89, add intra-frame compression, lossy mode for frames, and expanded colors. If you stuffed the new format frames end the end with index numbers old clients could play the sequence at a much lower framerate without too much of a hit to file size. But you accept some further bloat as a temporary measure to push adoption. In 10 years GIF libs can stop encoding the legacy frames by default. Don't make the mistake of supporting multiple codecs or complicating the format in other ways. That just puts you in the position of APNG or other would-be replacements: mostly ignored.