Re: [css3-transitions] colour space used for colour interpolations

Cameron McCormack:
>> (Brian mentioned to me that people also want to be able to
>> interpolate in other colour spaces, like HSL or L*a*b too -- we
>> could extend color-interpolation with options for that.)

L. David Baron:
> Are there obvious rules for interpolating in these spaces?  It's
> certainly not clear to me how to interpolate between hsl(0, 100%,
> 50%) and hsl(180, 100%, 50).

I don't know if there are defined rules for these anywhere.  Certainly 
not in the SVG spec at the moment.