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]. $DOCS_URL/03_usage/06_inputs/01_inputevent.md State of the [kbd]Alt[/kbd] modifier. State of the [kbd]Command[/kbd] modifier. State of the [kbd]Ctrl[/kbd] modifier. State of the [kbd]Meta[/kbd] modifier. State of the [kbd]Shift[/kbd] modifier.