Ev.KeyboardSourceKeyboard events.
The type for KeyboardEvent objects.
key k is the key attribute value of k. This value is affected by the current keyboard layout and modifier keys.
code k is a string that identifies the physical key of the event. This value is affected by the current keyboard layout or modifier state.
location k is the key location of k.
is_composing k is true if the event occurs between compositionstart and compositionend events.