Not to sound stupid, but what is the green button for, if not for making things full screen? When I click it on Safari, it does absolutely nothing. It seems redundant for them to have that green button, and the fullscreen button.
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_4 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8K2 Safari/6533.18.5) It's to make the window as full screen as it needs to be. Basically, the width of a website and the height (limited by your screen size of course)