KeyboardEventのテスト

キーボード入力:

keydown keypress keyup
KeyboardEvent.key
KeyboardEvent.code
KeyboardEvent.location※KeyLocationCode
KeyboardEvent.ctrlKey
KeyboardEvent.shiftKey
KeyboardEvent.altKey
KeyboardEvent.metaKey
KeyboardEvent.repeat
KeyboardEvent.isComposing
KeyboardEvent.getModifierState()
KeyboardEvent.charCode
KeyboardEvent.keyCode
KeyboardEvent.which
KeyboardEvent.keyIdentifier