Safari 7 is far too aggresive, virtually ignoring the autocomplete="off" directive added to form and input elements. Its predecessor had a preference that controlled this behavior. Why Apple decided to remove that preference and always AutoFill is beyond me, and became very frustrating when developing web applications that contained password fields. My personal login username and password for the site would override the value in these form fields. I'm okay with having to toggle AutoFill on and off as needed, but this wasn't an acceptable workaround for my clients.