Optional ReadonlycountHow many units back, for session, month and year. Default 1.
ReadonlyidStable id: what setRange takes and range() returns.
ReadonlyintervalThe interval the range shows. A host that does not offer it gets the
nearest interval it does offer (rangeInterval).
ReadonlylabelThe button's text.
Readonlyunit
A preset range for the bottom bar and
Widget.setRange.