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Subject: Re: Changing font weight with buffer-face-mode-invoke
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> Date: Wed, 26 Jun 2024 17:08:40 +0000
> From: Heime <heimeborgia@protonmail.com>
> Cc: help-gnu-emacs@gnu.org
> 
> > Use standard weights: regular, medium, bold. Some font families have
> > also additional weights: light, semi-light, semi-bold, extra-bold.
> > The full list of weight values is in the ELisp manual, in the node
> > "Face Attributes".
> 
> Some faces, e.g. "URW Chancery L" have "Medium Italic" and "Bold Italic".
> And not all faces have the weights declared in the list.  Could there be
> an elisp function that returns a list of the available weights and styles
> for each entry in the list of font families ?

I think you want list-fonts.  See the node "Low-Level Font" in the
ELisp manual, it describes this stuff.