Anyone have any experience using Auto expanding panels in web apps in order to gain screen real estate? I was thinking of something similar to pressing F11 in Firefox. This hides the browser controls and tabs unless user mouses over the top portion of the screen. I also find that the pin-able panels like in MS studio offers same advantage of allowing user to use available space to work by hiding less used panels. I have not seen many web apps that do this so I'm wondering if there is a good reason to avoid this model.