I'm gonna dig this topic for one question.. or should I say opinion.. I'm not sure whether this is a property of HTML5 or an intended game behavior, but I really don't like the need to have loading screen opened, while the game is loading up. Otherwise, when I have different browser tab opened, it is not getting any progress, even for several minutes (this is not current and also have never been in Flash). I'm that kind of lazy person who just can't stand looking at the loading bar filling slice by slice, I simply must turn that into browsing something.
Is this a known issue, or is it how HTML5 basically works and it's above our competences?