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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 20:51:06 +0200
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> Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Thu, 5 Dec 2019 19:24:23 +0100
> 
>  > Why are you bothered by that?  Why not (face-font 'default) instead?
> 
> Is that the default for a new frame?

No.  For a frame that was not yet created there are too many unknowns
for face-font to be able to help you efficiently.  The best you can do
is assume the new frame will have the same faces as the selected one.