code: function apiCloseTip(element, immediate) {
  		var displayController;
  
  		// set immediate to true when no element is specified
  		immediate = element ? immediate : true;
  
  		// find the relevant display controller
  		if (element) {
  			displayController = $(element).first().data(DATA_DISPLAYCONTROLLER);
  		} else if (session.activeHover) {
  			displayController = session.activeHover.data(DATA_DISPLAYCONTROLLER);
  		}
  
  		// if found, hide the tip
  		if (displayController) {
  			displayController.hide(immediate);
  		}
  
  		return element;
  	}
docs: Attempts to close any open tooltips.
  @param {(jQuery|Element)=} element The element with the tooltip that
  should be closed (optional).
  @param {boolean=} immediate Disable close delay (optional).
  @return {jQuery|Element|undefined} The original jQuery object or DOM
  Element, if one was specified.