Concerning the use of style="background-color" in printable versions of Wikipedia. For example, see List of Members of Congress who have represented Erie, Pennsylvania, in which cells are shaded according to political party. These cells are not shaded in the printable version. Is there a reason why style="background-color" does not work in print? I originally thought this was a transclusion issue or that Wikipedia printouts are restricted to black and white - the latter of which is certainly not the case, as a warning tag appears in colour here.
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backgrounds are usually never printed by a browsers to begin with and similarly for PDF, we want to create a 'quiet' and more 'rustic' reading experience.
But more importantly. This whole technique isn't allowed within Wikipedia for editorial reasons, as it is an accessibility problem for people with colorblindness and blindness. You should NEVER rely on color to communicate anything.
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wontfix. this is normal Print behavior as determined by browsers and also a potential accessibility problem.