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

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Chrome Full support 42Edge Full support ≤18Firefox Full support 44
Full support 44
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 37Safari ? WebView Android No support NoChrome Android Full support 42Firefox Android Full support 44Opera Android Full support 37Safari iOS ? Samsung Internet Android Full support 4.0


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.