    # File lib/compass/sass_extensions/functions/gradient_support.rb, line 314
        def color_stops_in_percentages(color_list)
          assert_type color_list, :List
          color_list = normalize_stops(color_list)
          max = color_list.value.last.stop
          last_value = nil
          color_stops = color_list.value.map do |pos|
            # have to convert absolute units to percentages for use in color stop functions.
            stop = pos.stop
            stop = stop.div(max).times(Sass::Script::Number.new(100,["%"])) if stop.numerator_units == max.numerator_units && max.numerator_units != ["%"]
            # Make sure the color stops are specified in the right order.
            if last_value && stop.numerator_units == last_value.numerator_units && stop.denominator_units == last_value.denominator_units && (stop.value * 1000).round < (last_value.value * 1000).round
              raise Sass::SyntaxError.new("Color stops must be specified in increasing order. #{stop.value} came after #{last_value.value}.")
            end
            last_value = stop
            [stop, pos.color]
          end
        end