# File lib/selenium/webdriver/common/window.rb, line 49
      def position=(point)
        unless point.respond_to?(:x) && point.respond_to?(:y)
          raise ArgumentError, "expected #{point.inspect}:#{point.class}" +
                                " to respond to #x and #y"
        end

        @bridge.setWindowPosition point.x, point.y
      end