SeleniumHQ/selenium · error · ArgumentError

expected #{point.inspect}:#{point.class} to respond to #x an

Error message

expected #{point.inspect}:#{point.class} to respond to #x and #y

What it means

Raised by Window#position= (ArgumentError) when the point argument does not respond to both #x and #y. The setter validates via respond_to? then calls bridge.reposition_window with point.x, point.y.

Source

Thrown at rb/lib/selenium/webdriver/common/window.rb:64

      #
      # Get the size of the current window.
      #
      # @return [Selenium::WebDriver::Dimension] The size.
      #

      def size
        @bridge.window_size
      end

      #
      # Move the current window to the given position.
      #
      # @param [Selenium::WebDriver::Point, #x and #y] point The new position.
      #

      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.reposition_window point.x, point.y
      end

      #
      # Get the position of the current window.
      #
      # @return [Selenium::WebDriver::Point] The position.
      #

      def position
        @bridge.window_position
      end

      #
      # Sets the current window rect to the given point and position.

View on GitHub (pinned to aa36b38e69)

Solutions

1. Pass Selenium::WebDriver::Point.new(x, y), or any object exposing x and y readers.
2. Use driver.manage.window.move_to(x, y) if available, which takes positional integers.
3. Ensure any custom geometry object defines attr_reader :x, :y.

Example fix

// before
driver.manage.window.position = [100, 200]

// after
driver.manage.window.position = Selenium::WebDriver::Point.new(100, 200)

def point_like?(obj)
  obj.respond_to?(:x) && obj.respond_to?(:y)
end

raise ArgumentError, 'invalid point' unless point_like?(pt)
driver.manage.window.position = pt

def point_like?(obj)
  obj.respond_to?(:x) && obj.respond_to?(:y)
end

When it happens

Trigger: Calling driver.manage.window.position = [0, 0] (Array), a hash {x:, y:}, an integer pair, or nil instead of a Point/object with x and y methods.

Common situations: Passing a coordinate array as with other windowing libraries; using a struct or OpenStruct that defines different accessor names; passing nil from a computation that returned no value.

Related errors

• expected #{dimension.inspect}:#{dimension.class} to respond
• expected #{rectangle.inspect}:#{rectangle.class} to respond
• Valid types are :tab and :window, received: #{type.inspect}
• incompatible proxy type #{type.inspect} (already set to #{@t
• cannot find element by #{how.inspect}

AI-assisted analysis of SeleniumHQ/selenium@aa36b38e69 (2026-08-14). Data as JSON: /api/errors/93cd1e5265f2532d. Report an issue: GitHub.