The pushsubscriptionchange event is fired to indicate a change in push subscription that was triggered outside the application's control, e.g. when browser refresh the push subscription. Previously, it was defined as the event to fire when a PushSubscription has expired.
PushEventself.addEventListener('pushsubscriptionchange', function() { // do something, usually resubscribe to push and // send the new subscription details back to the // server via XHR or Fetch });
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https://developer.mozilla.org/en-US/docs/Web/Events/pushsubscriptionchange