code: function normalizeUri(uri) {
    const anchor = createElement(TagName.A);
    // This is safe even though the URL might be untrustworthy.
    // The SafeURL is only used to set the href of an HTMLAnchorElement
    // that is never added to the DOM. Therefore, the user cannot navigate
    // to this URL.
    const safeUrl =
        uncheckedconversions.safeUrlFromStringKnownToSatisfyTypeContract(
            Const.from('This URL is never added to the DOM'), uri);
    setAnchorHref(anchor, safeUrl);
    return anchor.href;
  }
docs: Normalizes a URL by assigning it to an anchor element and reading back href.
  
  This converts relative URLs to absolute, and cleans up whitespace.
  @param {string} uri A string containing a URI.
  @return {string} Normalized, absolute form of uri.