function navigateToFragment(window, newURL, flags) {
  const document = idlUtils.implForWrapper(window._document);

  window._sessionHistory.clearHistoryTraversalTasks();

  if (!flags.replacement) {
    // handling replacement=true here deviates from spec, but matches real browser behaviour
    // see https://github.com/whatwg/html/issues/2796 for spec bug
    window._sessionHistory.removeAllEntriesAfterCurrentEntry();
  }
  const newEntry = { document, url: newURL };
  window._sessionHistory.addEntryAfterCurrentEntry(newEntry);
  window._sessionHistory.traverseHistory(newEntry, { nonBlockingEvents: true, replacement: flags.replacement });
}