Optional
element?: HTMLElementDate
object describing the lower and upper end of the new page's interval.
Whether the new page is after the one previously rendered (i.e. navigating forward).
Whether the new page is before the one previously rendered (i.e. navigating backward).
Whether month was changed (includes navigating to the same month in another year).
Whether the year was changed.
The HTML element targeted by the click;
undefined
when navigating programmatically.