confirm.inputBinding — the 'Confirm' control. Acting on the row a card has lit. Every device class is bound; a control missing one is refused at activation, naming the class it lacks. Both Space and Enter: a menu answers to whichever one the player reaches for. No touch counterpart, deliberately. Every row of every card is itself a button under a finger, and confirming the lit row is what tapping a row already does — an unlabelled circle in the corner of the screen that means "the row you cannot see the focus on" is a worse control than the row.