New in version 1.1.
Get component start offset:
abjad> staff = Staff("c'8 d'8 e'8 f'8")
abjad> f(staff)
\new Staff {
c'8
d'8
e'8
f'8
}
abjad> componenttools.get_component_start_offset(staff[1])
Offset(1, 8)
Return nonnegative fraction.