Both [`event.which`](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/which) and [`event.keyCode`](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode) are deprecated. Instead, we should use [`event.key`](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key) to identify keyboard events.
Both
event.whichandevent.keyCodeare deprecated. Instead, we should useevent.keyto identify keyboard events.