Method _update

lib/jsdom/living/nodes/HTMLCollection-impl.js:43–52

()

    return null;
  }
  _update() {
    if (this._version < this._element._version) {
      const snapshot = this._query();
      for (let i = 0; i < snapshot.length; i++) {
        this._list[i] = snapshot[i];
      }
      this._list.length = snapshot.length;
      this._version = this._element._version;
    }
  }
  get [idlUtils.supportedPropertyIndices]() {
    this._update();
    return this._list.keys();