# File lib/compass/sass_extensions/functions/gradient_support.rb, line 67
    def grad_position(color_list, index, default, radial = Sass::Script::Bool.new(false))
      assert_list(color_list)
      stop = color_list.values[index.value - 1].stop
      if stop && radial.to_bool
        orig_stop = stop
        if stop.unitless?
          if stop.value <= 1
            # A unitless number is assumed to be a percentage when it's between 0 and 1
            stop = stop.times(Sass::Script::Number.new(100, ["%"]))
          else
            # Otherwise, a unitless number is assumed to be in pixels
            stop = stop.times(Sass::Script::Number.new(1, ["px"]))
          end
        end
        if stop.numerator_units == ["%"] && color_list.values.last.stop && color_list.values.last.stop.numerator_units == ["px"]
          stop = stop.times(color_list.values.last.stop).div(Sass::Script::Number.new(100, ["%"]))
        end
        Compass::Logger.new.record(:warning, "Webkit only supports pixels for the start and end stops for radial gradients. Got: #{orig_stop}") if stop.numerator_units != ["px"]
        stop.div(Sass::Script::Number.new(1, stop.numerator_units, stop.denominator_units))
      elsif stop
        stop
      else
        default
      end
    end