HTML5 Notification not working in Mobile Chrome

Try the following:

navigator.serviceWorker.register('sw.js');
Notification.requestPermission(function(result) {
  if (result === 'granted') {
    navigator.serviceWorker.ready.then(function(registration) {
      registration.showNotification('Notification with ServiceWorker');
    });
  }
});

That is, use ServiceWorkerRegistration»showNotification() not new Notification().

That should work on Android both in Chrome and in Firefox — and on iOS in Safari, too.

(The sw.js file can just be a zero-byte file.)

One caveat is that you must run it from a secure origin (an https URL, not an http URL).

See https://developer.mozilla.org/docs/Web/API/ServiceWorkerRegistration/showNotification.

If you already have a service worker registered, use this:

navigator.serviceWorker.getRegistrations().then(function(registrations) {
  registrations[0].showNotification(title, options);
});

Running this code:

 if ('Notification' in window) {
  Notification.requestPermission();
}

Console in Chrome DevTools shows this error:

Uncaught TypeError: Failed to construct ‘Notification’: Illegal constructor. Use ServiceWorkerRegistration.showNotification() instead

A better approach might be:

function isNewNotificationSupported() {  
    if (!window.Notification || !Notification.requestPermission)  
        return false;  
    if (Notification.permission == 'granted')  
        throw new Error('You must only call this \*before\* calling 
Notification.requestPermission(), otherwise this feature detect would bug the 
user with an actual notification!');  
    try {  
        new Notification('');  
    } catch (e) {  
        if (e.name == 'TypeError')  
            return false;  
    }  
    return true;  
}

Function Source: HTML5Rocks