There is something about deception, it can bypass a lot of security controls through a very basic principle, to make you believe about something that isn’t there. It is a bit like magic.
Like this WEBSITE, where you can see an example of what the new HTML5 fullscreen function could make you believe. That you are on a bank website, where in fact you are on a phishing site. The previous link is harmless and only serves as an example, one I would advise you to try yourself (you can’t enter any details anyway in case you haven’t understood it isn’t really a Bank of America website).
Basically, they use the HTML5 Fullscreen function to recreate your browser TABS and URL. If you are not used to browse the internet in full screen mode then you would see the trick straight away. However, if you are following the trend to browse in full screen mode, especially on mobile phones or on MACs where apple has fully integrated it with the latest OS X (10.8), then it is something to watch out for. Very often, the most crude and simple hacks are what work best.