bootstrapAngular(modules, [rootElementSelector = '[ng-app]',
   Injector injectorFactory(List<Module> modules) = _defaultInjectorFactory]) {
 var allModules = new List.from(modules);
 List<dom.Node> topElt = dom.query(rootElementSelector).nodes.toList();
 assert(topElt.length > 0);

 // The injector must be created inside the zone, so we create the
 // zone manually and give it back to the injector as a value.
 Zone zone = new Zone();
 allModules.add(new Module()..value(Zone, zone));

 return zone.run(() {
   Injector injector = injectorFactory(allModules);
   injector.get(Compiler)(topElt)(injector, topElt);
   return injector;
 });
}