A little bit more nerdy here. What about the opposite direction, ie. moving from a sub-menu to its parent menu. I see both Amazon and new Khan Academy menu sh

A little bit more nerdy here. What about the opposite direction, ie. moving from a sub-menu to its parent menu. I see both Amazon and new Khan Academy menu shows instant opening of another submenu when my cursor moves over another parent menu item. I think there needs to be some delay when your cursor stays on another menu item in case you go back to the original parent menu item.