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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: The relationship of settings for font in init.el and the one
 shown on "Pick a font" UI.
Date: Thu, 07 Jan 2021 16:11:07 +0200
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 (message from Hongyi Zhao on Thu, 7 Jan 2021 10:25:44 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Thu, 7 Jan 2021 10:25:44 +0800
> Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
> 
> > Which is the problematic part?  The font name got recorded as
> > "family", is that the problem?  If not what is?
> 
> I mean the following relationships:
> 
> Book -- normal

That's expected: you cannot tell Emacs to use non-normal font for the
default face's font.  Emacs needs to be able to express "bold",
"italics", and "bold-italics" faces from the default font.

> Font size 14 --  height 143

Pixels vs font units.