class ActionHelpers(webdriver.Remote):
    def tap(self: T, positions: List[Tuple[int, int]], duration: Optional[int] = None) -> T:
        """Taps on an particular place with up to five fingers, holding for a
            certain time
    
            Args:
                positions: an array of tuples representing the x/y coordinates of
                    the fingers to tap. Length can be up to five.
                duration: length of time to tap, in ms
    
            Usage:
                driver.tap([(100, 20), (100, 60), (100, 100)], 500)
    
            Returns:
                Union['WebDriver', 'ActionHelpers']: Self instance
        """
        if len(positions) == 1:
            actions = ActionChains(self)
            actions.w3c_actions = ActionBuilder(self, mouse=PointerInput(interaction.POINTER_TOUCH, "touch"))
            x = positions[0][0]
            y = positions[0][1]
            actions.w3c_actions.pointer_action.move_to_location(x, y)
            actions.w3c_actions.pointer_action.pointer_down()
            if duration:
                actions.w3c_actions.pointer_action.pause(duration / 1000)
            else:
                # FIXME: I think the default pause time should be 0.1 seconds or (100/1000)
                actions.w3c_actions.pointer_action.pause(100)  
            actions.w3c_actions.pointer_action.release()
            actions.perform()