code: def key_down(self, value, element=None):
          
          if element:
              self.click(element)
          if self._driver.w3c:
              self.w3c_actions.key_action.key_down(value)
              self.w3c_actions.pointer_action.pause()
          else:
              self._actions.append(lambda: self._driver.execute(
                  Command.SEND_KEYS_TO_ACTIVE_ELEMENT,
                  {"value": keys_to_typing(value)}))
          return self
docs: Sends a key press only, without releasing it.
             Should only be used with modifier keys (Control, Alt and Shift).
  
          :Args:
           - value: The modifier key to send. Values are defined in `Keys` class.
           - element: The element to send keys.
             If None, sends a key to current focused element.
  
          Example, pressing ctrl+c::
  
              ActionChains(driver).key_down(Keys.CONTROL).send_keys('c').key_up(Keys.CONTROL).perform()