testFontSizeChanged() {
    // One can trigger the iframe resize by changing the
    // document.body.style.fontSize but the event is fired asynchronously in
    // Firefox.  Instead, we just override the lastWidth_ to simulate that the
    // size changed.

    let fired = false;
    events.listen(monitor, FontSizeMonitor.EventType.CHANGE, (e) => {
      fired = true;
    });

    monitor.lastWidth_--;

    const resizeEvent = new GoogEvent('resize', getResizeTarget());
    testingEvents.fireBrowserEvent(resizeEvent);

    assertTrue('The font size should have changed', fired);
  }
@suppress {visibility,checkTypes} suppression added to enable type
     checking