Update highlight background when forced colors are active (bug 1759886) #15921
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When forced color are active this updates the background of highlights to use CSS system colors, so Windows HCM mode will pick a highlight color that strongly contrasts the text.
Ideally we could add outlines for highlights and remove the background to provide better contrast, but I don't think this is possible without
forced-color-adjust: none
orcolor: transparent
support.