The keys the InputModel acts on; a shell maps its platform's key codes to these.
public enum InputKey
Spec #33 viewer capability 14. From the DOM's KeyboardEvent.key: "+" and "=" are Plus.
kind:method, kind:property, kind:ctor. Press Esc to clear.ArrowDownDown arrow: scrolls down a line; in a paged mode at the spread's bottom edge, turns to the next spread.ArrowLeftLeft arrow: scrolls left a line; in a paged mode with nothing to scroll left, turns to the previous spread.ArrowRightRight arrow: scrolls right a line; in a paged mode with nothing to scroll right, turns to the next spread.ArrowUpUp arrow: scrolls up a line; in a paged mode at the spread's top edge, turns to the previous spread.EndEnd: goes to the last page.HomeHome: goes to the first page.MinusMinus: zooms out a step about the viewport's centre.NoneAny other key: not handled.PageDownPage Down: scrolls on nine tenths of the viewport along the strip, or turns to the next spread in a paged mode.PageUpPage Up: scrolls back nine tenths of the viewport along the strip, or turns to the previous spread in a paged mode.PlusPlus (or equals): zooms in a step about the viewport's centre.ZeroZero: zooms to fit the current page's width.