Method createdCallback

src/custom-element.js:144–298

* Called when elements is created. Sets instance vars since there is no * constructor. * @final

()

     * @final
     */
    createdCallback() {
      // Flag "notbuilt" is removed by Resource manager when the resource is
      // considered to be built. See "setBuilt" method.
      /** @private {boolean} */
      this.built_ = false;

      /**
       * Several APIs require the element to be connected to the DOM tree, but
       * the CustomElement lifecycle APIs are async. This lead to subtle bugs
       * that require state tracking. See #12849, https://crbug.com/821195, and
       * https://bugs.webkit.org/show_bug.cgi?id=180940.
       * @private {boolean}
       */
      this.isConnected_ = false;

      /** @private {?Promise} */
      this.buildingPromise_ = null;

      /**
       * Indicates that the `mountCallback()` has been called and it hasn't
       * been reversed with an `unmountCallback()` call.
       * @private {boolean}
       */
      this.mounted_ = false;

      /** @private {?Promise} */
      this.mountPromise_ = null;

      /** @private {?AbortController} */
      this.mountAbortController_ = null;

      /** @private {!ReadyState_Enum} */
      this.readyState_ = ReadyState_Enum.UPGRADING;

      /** @type {boolean} */
      this.everAttached = false;

      /**
       * Ampdoc can only be looked up when an element is attached.
       * @private {?./service/ampdoc-impl.AmpDoc}
       */
      this.ampdoc_ = null;

      /**
       * Resources can only be looked up when an element is attached.
       * @private {?./service/resources-interface.ResourcesInterface}
       */
      this.resources_ = null;

      /** @private {!Layout_Enum} */
      this.layout_ = Layout_Enum.NODISPLAY;

      /** @private {number} */
      this.layoutCount_ = 0;

      /** @private {boolean} */
      this.isFirstLayoutCompleted_ = false;