Are there any GUI toolkits built on top of HTML Canvas like swing,swt,gtk or qt? So that it is possible to build applications like applets or flex gui:s inside the html canvas.
Mozilla Labs' Bespin project currently uses their own toolkit called Thunderhead. It's written by and for the Bespin developers, but it's a separate project that could be used for anything. You will need a (free) Bespin account to try it, since there aren't any other projects that I know of that use it.
I've never used it, but I know it uses the DOM and a subset of CSS plus it's own CSS-like properties. I doubt the API is very stable though since it's experimental and evolves with the needs of the Bespin developers.
