Okay, when you hover over the arrow part of a nav item like Resources here, for a split second it changes color before it pops down the menu. What CSS value is that? I am going crazy trying to find it. I found the before, and after. Not the in between though.
Between (.navTabs .navTab.PopupClosed) and (.navTabs .navTab.PopupOpened) there is something that is there in between on hover.