// https://html.spec.whatwg.org/multipage/system-state.html#navigatorlanguage
interface mixin NavigatorLanguage {
  readonly attribute DOMString language;
  // FIXME: readonly attribute FrozenArray<DOMString> languages;
  //        This is supposed to be a FrozenArray that always returns the same object
  readonly attribute sequence<DOMString> languages;
};