code: function () {
          var self = this, node, i = this.length;
  
          while (i--) {
            node = self[i];
            while (node.firstChild) {
              node.removeChild(node.firstChild);
            }
          }
  
          return this;
        }
docs: Empties all elements in set.
  
  @method empty
  @return {tinymce.dom.DomQuery} Current set with the empty nodes.