code: def get_window_size(self, windowHandle='current'):
          
          command = Command.GET_WINDOW_SIZE
          if self.w3c:
              if windowHandle != 'current':
                  warnings.warn("Only 'current' window is supported for W3C compatibile browsers.")
              size = self.get_window_rect()
          else:
              size = self.execute(command, {'windowHandle': windowHandle})
  
          if size.get('value', None) is not None:
              size = size['value']
  
          return {k: size[k] for k in ('width', 'height')}
docs: Gets the width and height of the current window.
  
          :Usage:
              ::
  
                  driver.get_window_size()