Zooming out via the browser increases view
Zooming out with the browsers in-built zoom (Ctrl + Scroll) renders more of the map, effectively allowing players to see an entire island.
Personal note: I have mixed feelings about this handy "feature". When the users view is limited it creates more of an exploration feeling, but it is also nice to simply zoom out to see where you have to go. (also, at 25% zoom in Chrome the view glitches and is moved a bit to the left)