chromium/chrome/test/data/extensions/api_test/service_worker/push_messaging/page.html

<!--
  // Note that PushMessagingDispatcher::DoSubscribe() only looks at the web
  // manifest, so we list the manifest here.
  // However, this also means we cannot use PushMessaging from a service
  // worker which does not have an associated HTML page
  // (_generated_background_page.html).
  //
  // TODO(lazyboy): We should probably look into improving this:
  // http://crbug.com/558173.
-->
<link rel="manifest" href="web_manifest.json">
<script src="page.js"></script>