2.1.493 Part 4 Section 184.108.40.206, BIBLIOGRAPHY
a. The standard does not specify default behavior when the \f switch is present without an argument.
In Word, if the argument for \f is not specified, then the language from the \l switch is used if specified.
b. The standard does not define the format of the arguments of the \l and \f switches.
Word defines the format of these switches to be any language code value from the table in ST_LangCode ("[ECMA-376] Part 4 §2.18.52; ST_LangCode").
c. The standard says \m switch specifies which single source to show in the bibliography.
In Word, the \m switch may be used repeatedly to specify a set of sources to show in the bibliography.
d. The standard allows the /f and /l switches to supply different locales.
In Word, if the /f and /l switches supply different locales, then the locale supplied with /f is used for /l.