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Makes a string that matches CSS syntax for websites
returns RRGGBBAA, even if a== 255
Makes a hex string RRGGBBAA (aa only present if it is not 255)
from hsl
Gets a color by name, iff the name is one of the static members listed above
Reads a CSS style string to get the color. Understands #rrggbb, rgba(), hsl(), and rrggbbaa
Convenience functions for common color names
Represents an RGBA color