What I will write here is how it works for me best - other people may have their own ways. It will be example of horizontal scrolling game and explanation will be applied to this type of game.  Let's say we have basic resolution 800 x 600 and browser window is 1200 x 700. Grey rect is browser window and blue one is our basic game resolution.  Besic resolution for me is mainly best resolution from game design point of view. As we are making side scroller, it is ok for us if player