Method disconnect

src/custom-element.js:1376–1402

* Called when an element is disconnected from DOM, or when an ampDoc is * being disconnected (the element itself may still be connected to ampDoc). * * This callback is guarded by checks to see if the element is still * connected. See #12849, https://crbug.com/821195, and *

(pretendDisconnected)

     *     of DOM isConnected.
     */
    disconnect(pretendDisconnected) {
      if (this.isInTemplate_ || !this.isConnected_) {
        return;
      }
      if (!pretendDisconnected && dom.isConnectedNode(this)) {
        return;
      }

      // This path only comes from Resource#disconnect, which deletes the
      // Resource instance tied to this element. Therefore, it is no longer
      // an AMP Element. But, DOM queries for i-amphtml-element assume that
      // the element is tied to a Resource.
      if (pretendDisconnected) {
        this.classList.remove('i-amphtml-element');
      }

      this.isConnected_ = false;
      this.getResources().remove(this);
      if (this.impl_) {
        this.impl_.detachedCallback();
      }
      if (this.R1()) {
        this.unmount();
      }
      this.toggleLoading(false);
      this.disposeMediaAttrs_();
    }

    /**
     * Dispatches a custom event only in testing environment.