OptionalanchorThe element the accessory stands in for, in the page: its theme mode and surface are carried onto the accessory when no float provider supplies a theme.
OptionalchildrenOptionalclassWhether the content rides the top of the virtual keyboard. While false it stays mounted but
hidden, so a field inside keeps its focus and its keyboard across the change.
OptionalonCalled when the keyboard goes away while floating (the Android back gesture, the keyboard's own hide key, Safari's Done), so the owner can end what the keyboard was for.
OptionalonCalled as the accessory shows and hides, after it has settled: an in-page twin fades the other way, so the content looks to have moved.
Optionalstyle
Props for KeyboardAccessory.