code: function restore(event) {
  	        // We're only bothered about height and width on the container
  	        if (event.target !== container || !['width', 'height'].includes(event.propertyName)) {
  	          return;
  	        } // Revert back to auto
  
  
  	        container.style.width = '';
  	        container.style.height = ''; // Only listen once
  
  	        off.call(_this9, container, transitionEndEvent, restore);
  	      }
docs: Restore auto height/width