[Seaside] Canvas API?

[Carl Gundel]

Is there is definitive document explaining what Seaside's canvas API is,
what the motivation was for creating it and how to use it?  I'm not quite
sure but I think I'm using the old API, and maybe mixing the old and new in
some places.  I've tried looking around for this kind of information but
haven't had any luck.

Thanks,

-Carl Gundel, author of Liberty BASIC
http://www.libertybasic.com