In a current project, the designer asked if we could add a little gimmick to the horizontal navigation, which consists of just a few one-level items. Of course the idea is visual-, desktop-, and mouse-input-device-centric, and a discussion about other devices and the resulting state of the navigation ensued, and we agreed to treat this as a nice to have if everything else is cared for.
Nevertheless I was intrigued; would it be possible to animate a border to 'slide' from one menu item to the next on (mouse)over? So if you 'leave' the currently hovered item, the line should ...