aligment-adjust property

This is a request for clarification please.

The alignment-adjust property has the values "before-edge" and "after-edge"
as legal values. However, according to the definition of these baselines in
section 7.13 (7.14 in the draft) they are only defined for line areas. The
alignment-adjust property is defined only for formatting objects generating
inline areas. Inline areas don't have those baselines and therefore I don't
understand how such a value for alignment-adjust should be interpreted.

Thank you

Manuel