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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: New line and trailing whitespaces
Date: Mon, 22 Apr 2024 08:39:31 +0300
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 (message from Ergus on Sun, 21 Apr 2024 23:05:57 +0200)
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> Date: Sun, 21 Apr 2024 23:05:57 +0200
> From: Ergus <spacibba@aol.com>
> Cc: help-gnu-emacs@gnu.org
> 
> Hi Eli:
> 
> On Sun, Apr 21, 2024 at 08:23:45AM GMT, Eli Zaretskii wrote:
> >> Date: Sun, 21 Apr 2024 03:12:37 +0200
> >> From: Ergus <spacibba@aol.com>
> >> Cc: help-gnu-emacs@gnu.org
> >>
> >> A somehow unrelate question.. I don't find a face to change the tab-mark
> >> color in whitespace mode... Is it documented somewhere?
> >
> >Isn't that whitespace-tab?
> >
> Actually no.
> 
> That face seems apply only to the tab whitespace when whitespace-style
> has `tabs`, but not to when `tab-mark` applies.

You lost me here.  But if all you want is to know what face is used on
some text, simply use "M-x describe-text-properties RET" with point on
that text.