2.1.537 Part 4 Section 220.127.116.11, TOC
a. The standard does not specify behavior when both the \f and \l switches are used.
In Word, if the \f switch is used after the \l switch, the \f switch supersedes the levels specified to include all levels.
b. The standard says that the \p switch argument is a sequence of characters.
Word only allows a single character in the argument of the \p switch and ignores any additional characters.