When a push subscription is being revoked, notify the web developer by placing something in the Web Inspector console. Perhaps a message could also be sent to the Reporting API. > When a permission is revoked, the user agent MAY fire the "pushsubscriptionchange" event > for subscriptions created with that permission, with the service worker registration > associated with the push subscription as registration, a PushSubscription instance > representing the push subscription as oldSubscription, and null as newSubscription. > The user agent MUST deactivate the affected subscriptions in parallel. see https://w3c.github.io/push-api/#security-and-privacy-considerations