[mratzloff]

Animation is now considered a core feature of GIF, but it was implemented as an extension by Netscape and surprisingly there is no official spec for it.

Extensibility is provided for in the specification, but the actual implementation within each application extension is, of course, application-specific.

The extensions I know about:

- NETSCAPE (animation)

- NETSCAPE (buffering)

- ANIMEXTS (same as Netscape animation)

- GIFCONnb (found this GIF Construction Set extension during testing but didn't try to reverse engineer it)

The only one of consequence is the animation one.

The page I used at the time to describe the animation extension no longer exists, but this page describes it and others:

http://www.vurdalakov.net/misc/gif