This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The notification read-only property of the NotificationEvent interface returns the instance of the Notification that was clicked to fire the event. The Notification provides read-only access to many properties that were set at the instantiation time of the Notification such as tag and data attributes that allow you to store information for defered use in the notificationclick event.


A Notification object.


self.addEventListener('notificationclick', function(event) {
  console.log('On notification click');

  // Data can be attached to the notification so that you
  // can process it in the notificationclick handler.
  console.log('Notification Tag:', event.notification.tag);
  console.log('Notification Data:',;

  // This looks to see if the current is already open and
  // focuses if it is
    type: "window"
  }).then(function(clientList) {
    for (var i = 0; i < clientList.length; i++) {
      var client = clientList[i];
      if (client.url == '/' && 'focus' in client)
        return client.focus();
    if (clients.openWindow)
      return clients.openWindow('/');


Specification Status Comment
Notifications API
The definition of 'notification' in that specification.
Living Standard Living standard.

Browser Compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support42 Yes441 ?37 ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No42 ?4437 ?4.0

1. Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR).


Document Tags and Contributors

Contributors to this page: fscholz, jpmedley, PaulKinlan, chrisdavidmills, rolfedh
Last updated by: fscholz,