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pldoc_style.pl
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 theme(+Theme, +Element, +Condition, -CSS) is semidet[multifile]
Multifile hook that is used by theme files to modify the style of Element if Condition holds in Theme. See prolog:console_color/3 for Theme. CSS is merged with the default style. If Theme does not define Element and Condition, the theme it is based on is used (see prolog:theme_base/2).