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Unmaintained [ShikiSuen] Fake HSV Color System + One Hue Color Domination

Q: Why make this in lieu of using "HSV(H, S, V)"?
A: Because XenForo color picker in XenForo 2.1.x has limitations.

Q: Why some colors are still shown as question marks in color pickers of non-color property groups?
A: This is a bug in XenForo 2.1.0 - 2.1.9 and is fixed in 2.1.10 release.