ntResizable) {
      if (parentResizable) {
        window.removeEventListener('resize', this._boundNotifyResize);
      }
    },

    _notifyDescendant: function(descendant) {
      // NOTE(cdata): In IE10, attached is fired on children first, so it's
      // important not to notify them if the parent is not attached yet (or
      // else they will get redundantly notified when the parent attaches).
      if (!this.isAttached) {
        return;
      }

      this._notifyingDescendant = true;
      descen