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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: What is a default font?
Date: Thu, 05 Dec 2019 17:03:18 +0200
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> From: Štěpán Němec <stepnem@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  emacs-devel@gnu.org
> Date: Wed, 04 Dec 2019 20:38:26 +0100
> 
>  @defun default-font-width
>  This function returns the average width in pixels of the font used by
> -the current buffer's default face.
> +the selected frame's default face.
>  @end defun

Thanks.  However, it is incorrect not to mention the current buffer at
all, because these functions are sensitive to face remapping, which is
a buffer-local feature.

I think Stefan and Martin in their followup messages described the
situation correctly.  I do agree that documentation could use some
clarification in this area.