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Add CSS System Colors link, update to canvas colors from windows colors
=== With HCM enabled ===
Colors should be mapped semantically from the typical application palette to the reduced palette supplied by the operating system. Colors outside this palette should not be used because they will not adapt to users' preferences. Mapping should not result in a loss of information or context (eg. selected items should remain visually distinct from non-selected items, and information should not be communicated by color alone). The following are traditional foreground / background mappingsgiven in [https://www.w3.org/wiki/CSS/Properties/color/keywords#System_Colors CSS System Colors]:
* Selected elements should use SelectedItemText / SelectedItem
* Controls should use ButtonText / ButtonFace
* Visited links should use MozNativeVisitedHyperlinkText for their foreground, background preserved
* Inactive components should preserve their background, but change their foreground to GrayText
* Components not in the above categories should use CanvasText / Canvas (older implementations may use WindowText / Window)
For components which represent a combination of states, a combination of colors is necessary. For example:
