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I am referring to the fact that there are more or less simple algorithms you can use to determine the dark version of colors, or rather, perceptually darker variants (e.g. APCA). The browser could make the contrast threshold configurable.

Oh, and there is inverse(), but I have no idea how good that is.

Firefox appears to support a light and dark mode, custom foreground and background colors, and setting a default font face and size. Nothing like full user stylesheet support, at least not without extensions.

It does support the userContent.css file in the profile, there's just no UI for it.

safari still supports it on mac