Method startRender_

src/friendly-iframe-embed.js:500–542

* @private * @restricted

()

   * @restricted
   */
  startRender_() {
    if (this.host) {
      this.host.renderStarted();
    } else {
      this.signals_.signal(CommonSignals_Enum.RENDER_START);
    }

    // TODO(ccordry): remove when no-signing launched.
    if (!this.spec.skipHtmlMerge) {
      // When not streaming renderStart signal is good enough.
      this.renderComplete_.resolve();
    }

    // Common signal RENDER_START indicates time to toggle visibility
    setStyle(this.iframe, 'visibility', '');
    if (this.win.document && this.win.document.body) {
      this.win.document.documentElement.classList.add('i-amphtml-fie');
      setStyles(dev().assertElement(this.win.document.body), {
        opacity: 1,
        visibility: 'visible',
        animation: 'none',
      });
    }

    // Initial load signal signal.
    let rect;
    if (this.host) {
      rect = this.host.getLayoutBox();
    } else {
      rect = layoutRectLtwh(
        0,
        0,
        this.win./*OK*/ innerWidth,
        this.win./*OK*/ innerHeight
      );
    }
    Promise.all([
      this.whenRenderComplete(),
      whenContentIniLoad(this.ampdoc, this.win, rect),
    ]).then(() => {
      this.signals_.signal(CommonSignals_Enum.INI_LOAD);
    });
  }

  /**
   * @return {!HTMLBodyElement}