code: function (sortableElement) {
          var opts = addData(sortableElement, 'opts') || {};
          var items = _filter(sortableElement.children, opts.items);
          var handles = _getHandles(items, opts.handle);
          // remove event handlers & data from sortable
          removeEventListener(sortableElement, 'dragover');
          removeEventListener(sortableElement, 'dragenter');
          removeEventListener(sortableElement, 'drop');
          // remove event data from sortable
          _removeSortableData(sortableElement);
          // remove event handlers & data from items
          removeEventListener(handles, 'mousedown');
          _removeItemEvents(items);
          _removeItemData(items);
      }
docs: Destroy the sortable
  @param {HTMLElement} sortableElement a single sortable