[tex4ht] [bug #623] Images inverted with dark mode by default html5 css

[Oliver Freyermuth]

URL:
  <http://puszcza.gnu.org.ua/bugs/?623>

                 Summary: Images inverted with dark mode by default html5 css
                 Project: tex4ht
            Submitted by: olifre
            Submitted on: Tue Apr  9 00:38:42 2024
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Minor
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Dear Karl,

feel free to close if this is intended — after updating from TeXlive 2021 to
2023, I noticed that with the default CSS and HTML5 mode in a dark-themed
browser, all image colours are inverted. 

Body background colour and text colours are unaffected, but images are caught
by the rule:

        \Css{
 	  @media (prefers-color-scheme: dark) {
 	    img[src^="\jobname"]{filter: invert(1); }
 	  }
 	}

which was added in
https://tug.org/svn/texlive/trunk/Master/texmf-dist/source/generic/tex4ht/tex4ht-html5.tex?r1=64099&r2=65513
. The comment there mentions this is a fix for:
"background of generated images in the dark mode"
so I presume it was added on purpose. 

It seems quite irritating for a default — black graphics (e.g. pgfornaments)
vanish against the white background when shown in a dark-themed browser, and
photos get inverted colours. 

I'm personally using:

filter: drop-shadow(7px 7px 4px rgba(0, 0, 0, .7)) invert(0) !important;

in my CSS for all images to overwrite that. and of course "nostyle" might be
what I should actually be using when using a custom CSS. 

As outlined, if the default is intended, feel free to close. 
Thanks!




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