bug#47339: 28.0.50; Info-quoted face: no attributes, looks too small

[Jean Louis]

* Eli Zaretskii <eliz@gnu.org> [2021-03-23 14:09]:
> > From: Jean Louis <bugs@gnu.support>
> > Date: Tue, 23 Mar 2021 13:17:44 +0300
> > 
> > In emacs -Q, I can see that Info-quoted face is too small and has no
> > attributes, it does not help in readability of the info file. 
> > 
> > Face: Info-quoted (sample) (customize this face)
> 
> That's something specific to your setup, I don't see any such problem
> here.
> 
> What are the attributes of the fixed-pitch-serif face on that system?

How do I get attributes for that?