Safari's logic is such that if you press the green button, the page will go to the size necessary to show the page in its entirety. Most webpages don't require full-screen browsing (the Apple website is a good example of this). Thus, Safari's logic is to conserve screen space, rather than have lots of empty space rendered on your screen.
Ahhh, thanks for this, i just got a swish new MacBook Pro and am relearning the 'mac ways' after 10 years of pc's
Was wondering about the green button and no fullscreen window
loving the mac totally... shoulda done it years ago.....