2.1.484 Part 1 Section 17.16.5.33, LISTNUM

a.   The standard says that If the \l switch is omitted for a new series, the default value is 3.

In Word, if the \l switch is omitted for a new series, the default value depends on the ilvl of the paragraph.

b.   The standard allows the LISTNUM to be nested inside another field.

In Word, the LISTNUM field is ignored if nested inside another field.

c.   The standard does not specify the behavior in the event that no previous numbered paragraph or LISTNUM is present in the document.

Word uses the NumberDefault sequence by default.