The work is still under progress...

...it seems like creating interoperable canvas would take more time than we expected before. The main reason is a cross-domain security model which is implied in current browsers. This would not allow us to use XMLHttpRequest object to interchange data between javascript canvas (which has been loaded from our server) and customer's http server.
Certainly, this restriction makes sense, but prevents our job to get done. Therefore we've found another way to transport our data. But this method has its own restriction that enforces us to rewrite imposing amount of code.
But there is also a good news. Litha has got additional help topics, thanks to Egor Emeliyanov. He wrote "Working with documents" section and several topics for "Drawing" section. We appreciate his time. Litha still doesn't make money (because of free registration and lack of adv), so contribution is highly appreciated.

Sincerely yours, Litha-Paint team.