/usr/share/nano/man.nanorc is in nano 2.9.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ## Here is an example for manpages.
syntax "man" "\.[1-9]x?$"
magic "troff or preprocessor input"
comment ".\""
color green "\.(SH|SS|TH) .*$"
color brightgreen "\.(SH|SS|TH) " "\.([HIT]P)"
color brightred "\.(B[IR]?|I[BR]?|R[BI]|S[BM]) .*$"
color brightblue "\.(B[IR]?|I[BR]?|R[BI]|S[BM]) " "\.([LP]?P)$"
color magenta "\\f[BIPR]"
color yellow "\.(br|DT|RS|RE|PD)"
# Comments.
color cyan "\.?\\\".*$"
# Trailing whitespace.
color ,green "[[:space:]]+$"
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