function maybeFetchAndProcess(el) {
  if (!isExternalResourceLink(el)) {
    return;
  }

  // Browsing-context connected
  if (!el.isConnected || !el._ownerDocument._defaultView) {
    return;
  }

  fetchAndProcess(el);
}
function maybeFetchAndProcess(el) {
  if (!isExternalResourceLink(el)) {
    return;
  }

  
  if (!el.isConnected || !el._ownerDocument._defaultView) {
    return;
  }

  fetchAndProcess(el);
}
function maybeFetchAndProcess ( el ) { if ( ! isExternalResourceLink ( el ) ) { return ; } // Browsing-context connected if ( ! el . isConnected || ! el . _ownerDocument . _defaultView ) { return ; } fetchAndProcess ( el ) ; }
https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet
https : // html . spec . whatwg . org / multipage / links . html#link - type - stylesheet