Service worker supports notifications: https://developers.google.com/web/updates/2015/03/push-notifications-on-the-open-web?hl=en https://developers.google.com/

Service worker supports notifications: https://developers.google.com/web/updates/2015/03/push-notifications-on-the-open-web?hl=en https://developers.google.com/web/updates/2015/03/push-notif... The primary use cases for service workers today are robust offline support and notifications. More generally service worker gives you broad and very fine grained control over your app's use of the network. Service worker itself doesn't give additional cross-origin request abilities, except by giving more control over caching. Web Bluetooth is still a work in progress, but you can try it out: https://developers.google.com/web/updates/2015/07/interact-with-ble-devices-on-the-web?hl=en https://developers.google.com/web/updates/2015/07/interact-w... (disclosure: I work on this kind of stuff for Google)