loadStyleSrc(url) {
    const newStyle = _a.doc.createElement("link");
    newStyle.href = url;
    newStyle.rel = "stylesheet";
    newStyle.type = "text/css";
    _a.doc.head.appendChild(newStyle);
  }
Attach a new remote stylesheet link to the end of HEAD synchronously
NOTE: It takes too long for most scripts to finish loading
      so this is pretty useless to work with the dynamic UI features directly.
@param {string} url The url to be used in the style link href attribute