code: def multi_click(self, locator, params=None, timeout=None):
          
          platform = self.execute_script('return navigator.platform')
          multi_key = Keys.COMMAND if 'mac' in platform.lower() else Keys.LEFT_CONTROL
          self._click(locator, params, timeout, multi_key)
docs: Presses left control or command button depending on OS, clicks and then releases control or command key.
  
          :param locator: locator tuple or WebElement instance
          :param params: (optional) locator parameters
          :param timeout: (optional) time to wait for element
          :return: None