Display keyboard event details for any pressed key
Click here, then press any key
Arrow / space / tab won't scroll the page while focused.
About KeyboardEvent
key vs code
event.key is the printable character produced by the key (layout-aware). event.code is the physical key on the keyboard (layout-independent), e.g. KeyA.
keyCode / which
keyCode and which are legacy fields kept for compatibility. Prefer key / code in new code.