Method openInContainer

third_party/subscriptions-project/swg.js:10918–10930

* Opens the iframe embedded in the given container element. * @param {!Element} containerEl

(containerEl)

   * @param {!Element} containerEl
   */
  openInContainer(containerEl) {
    const iframe = this.iframe_;
    if (iframe.isConnected()) {
      throw new Error('already opened');
    }

    containerEl.appendChild(iframe.getElement());

    return iframe.whenReady().then(() => {
      this.buildIframe_();
      return this;
    });
  }

  /**
   * Build the iframe with the styling after iframe is loaded.