code: function (items, sort) {
          var self = this, nodes, i;
  
          if (isString(items)) {
            return self.add(DomQuery(items));
          }
  
          if (sort !== false) {
            nodes = DomQuery.unique(self.toArray().concat(DomQuery.makeArray(items)));
            self.length = nodes.length;
            for (i = 0; i < nodes.length; i++) {
              self[i] = nodes[i];
            }
          } else {
            push.apply(self, DomQuery.makeArray(items));
          }
  
          return self;
        }
docs: Adds new nodes to the set.
  
  @method add
  @param {Array/tinymce.core.dom.DomQuery} items Array of all nodes to add to set.
  @param {Boolean} sort Optional sort flag that enables sorting of elements.
  @return {tinymce.dom.DomQuery} New instance with nodes added.