testGetElementsByTagName() {
    const divs = googDom.getElementsByTagName(TagName.DIV);
    assertTrue(divs.length > 0);
    const el = googDom.getRequiredElement('testEl');
    const spans = googDom.getElementsByTagName(TagName.SPAN, el);
    assertTrue(spans.length > 0);
  }
@suppress {checkTypes} suppression added to enable type
                    checking