Base class for keys events with modifiers. Contains keys events information with modifiers support like [kbd]Shift[/kbd] or [kbd]Alt[/kbd]. See [method Node._input]. https://docs.godotengine.org/en/latest/tutorials/inputs/inputevent.html State of the [kbd]Alt[/kbd] modifier. State of the [kbd]Cmd[/kbd] modifier. State of the [kbd]Ctrl[/kbd] modifier. State of the [kbd]Meta[/kbd] modifier. State of the [kbd]Shift[/kbd] modifier.