code: function getAscendantTrigger( that ) {
  		var node = that.element,
  			trigger;
  
  		if ( node && isHtml( node ) ) {
  			trigger = node.getAscendant( that.triggers, true );
  
  			// If trigger is an element, neither editable nor editable's ascendant.
  			if ( trigger && that.editable.contains( trigger ) ) {
  				// Check for closest editable limit.
  				// Don't consider trigger as a limit as it may be nested editable (includeSelf=false) (#12009).
  				var limit = getClosestEditableLimit( trigger );
  
  				// Trigger in nested editable area.
  				if ( limit.getAttribute( 'contenteditable' ) == 'true' )
  					return trigger;
  				// Trigger in non-editable area.
  				else if ( limit.is( that.triggers ) )
  					return limit;
  				else
  					return null;
  
  				return trigger;
  			} else
  				return null;
  		}
  
  		return null;
  	}
docs: Gets the closest parent node that belongs to triggers group.