On Wed, Oct 14, 2020, Damian McGuckin wrote: > How many people use features of 'groff' that are not in 'troff'?
The mom macros rely heavily on extensions to groff that were implemented during Werner's term. Since many (most?) new groff users these days gravitate towards mom, I'd say quite a lot of people rely on those features. I learned troff entirely from ctsr54. It is not for nothing that it remains the canonical starting point for exploring groff. Prentice-Hall published _Troff Typesetting for UNIX Systems_ (Emerson, Paulsel) in 1987. It's still available online. It might be the very thing the OP is looking for. -- Peter Schaffter https://www.schaffter.ca
