I think it's because "supporting HTML5" is something with nebulous meaning, and not allowing people to make canvas games in this day and age would be shooting themselves in the foot big time, so it's quite unlikely that they won't. I don't think that deserves downvotes, though. People just surly.
I see. Still, I don't think "HTML5 games" is as vague as "HTML5" - it pretty much means either canvas or SVG. And it would be nice to hear an explicit line from Google on it - not sure why they haven't actually stated the supported technologies yet. I suppose they're still working on it.
