Sorry, I don't think I'll be able to do that. It's the second time I'm making a game using my own engine, and I already run into problems exporting it into an executable. Just thinking of all the changes I'd have to make so that it could run in a browser is a lot. If I made it using unity then it'd be a whole lot easier.
But for mac it should work, as well as any other operating system. Not sure if it does, as I haven't experimented with it, but from what I've read it should be functional.