Accessibility
DateRangeInput is one group. label names it. rangeLabels name the start and the end and are read before the group label. The trigger is a read-only text field with the formatted range (or the active mode's formatted end); it opens the calendar popover. Dates are chosen on the calendar, not typed in the trigger.
The calendar button uses calendarLabel. The popover uses calendarTitle, which is not painted. The default strip is a radiogroup named by modeSelectLabel, and the same name is on the combobox that leads the field. Reset and Apply use resetLabel and applyLabel. Apply is the only accent button.