navigate.inputBinding — the 'Navigate' control. Walking the rows of a card. Every device class is bound; a control missing one is refused at activation, naming the class it lacks. On a keyboard each direction answers to TWO keys — the WASD key and the arrow key beside it — because a player reaching for a menu uses whichever is already under their hand. An axis takes one binding per class, so each direction is itself a vector of the two keys that mean it: a vector arm contributes its travel whenever it reads anything at all, so either key drives that direction.