New in version 2.0.
Get down-markup attached to component:
abjad> chord = Chord([-11, 2, 5], (1, 4))
abjad> markuptools.Markup('UP', 'up')(chord)
Markup('UP', direction='^')(<cs d' f'>4)
abjad> markuptools.Markup('DOWN', 'down')(chord)
Markup('DOWN', direction='_')(<cs d' f'>4)
abjad> markuptools.get_down_markup_attached_to_component(chord)
(Markup('DOWN', direction='_')(<cs d' f'>4),)
Return tuple of zero or more markup objects.