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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Is there an equivalent to setq-local for faces?
Date: Thu, 23 Sep 2021 18:52:21 +0300
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In-Reply-To: <871r5fid1v.fsf@ucl.ac.uk> (message from Eric S Fraga on Thu, 23
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> From: Eric S Fraga <e.fraga@ucl.ac.uk>
> Date: Thu, 23 Sep 2021 15:25:48 +0100
> 
> On Wednesday, 22 Sep 2021 at 16:50, Eli Zaretskii wrote:
> > Why do you think it does?
> 
> I had the impression that any change I made to a face was reflected in
> every frame

That's because many Emacs APIs for changing face attributes by default
actively propagate the changes to all frames.  But you can avoid that
by using the FRAME argument.  See, for example, set-face-attribute.