# File lib/selenium/webdriver/common/action_builder.rb, line 84
      def move_to(element, right_by = nil, down_by = nil)
        if right_by && down_by
          @actions << [:mouse, :move_to, [element, right_by, down_by]]
        else
          @actions << [:mouse, :move_to, [element]]
        end

        self
      end