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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The ServiceWorkerGlobalScope.onpush event of the ServiceWorkerGlobalScope interface is fired whenever a push message is received by a service worker via a push server.


ServiceWorkerGlobalScope.onpush = function(PushEvent) { ... }
self.addEventListener('push', function(PushEvent) { ... })


The following example takes data from a PushEvent and displays it on all of the service worker's clients. The data payload of the push message is available in the event object's data property (, which contains a PushMessageData object.)

self.addEventListener('push', function(event) {
  if (!(self.Notification && self.notification.permission === 'granted')) {

  var data = {};
  if ( {
    data =;
  var title = data.title || "Something Has Happened";
  var message = data.message || "Here's something you might want to check out.";
  var icon = "images/new-notification.png";

  var notification = new Notification(title, {
    body: message,
    tag: 'simple-push-demo-notification',
    icon: icon

  notification.addEventListener('click', function() {
    if (clients.openWindow) {


Specification Status Comment
Push API
The definition of 'onpush' in that specification.
Working Draft Initial definition. This event is specified in the Push API, but accessed through ServiceWorkerGlobalScope.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 42.0 44.0 (44.0)[1] No support ? No support
Feature Android Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? 44.0 (44.0) (Yes) No support ? No support 42.0

[1] Service workers (and Push) have been disabled in the Firefox 45 Extended Support Release (ESR.)

See also

Document Tags and Contributors

 Contributors to this page: chrisdavidmills, Sheppy, Sebastianz, jpmedley, kscarfone
 Last updated by: chrisdavidmills,