ReadonlyaltIf falsey, the alt key is not pressed.
ReadonlycodeReadonlyctrlIf ctrlKey is undefined, that is equivalent to ctrlKey = false.
Readonlykeykey, as given by an HTML KeyboardEvent
ReadonlykindReadonlyshiftIf falsey, the shift key is not pressed.
Represents a key release or auto-repeated key releae event.
Use keyUpEventFromHTMLEvent where possible rather than constructing directly (required properties may change between minor releases).