2.1.1163 Part 1 Section 19.5.46, hsl (HSL)

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a.   The standard does not state how to interpret a negative s attribute value.

PowerPoint reverses the direction of the color interpolation when the s attribute's value is negative.

b.   The standard does not state how to interpret a negative l attribute value.

PowerPoint reverses the direction of the color interpolation when the l attribute's value is negative.