This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
var subId = pushSubscription.subscriptionId;
|Push API||Working Draft||Initial definition|
|Feature||Android webview||Chrome for Android||Edge mobile||Firefox for Android||Opera Android||iOS Safari||Samsung Internet|
1. Service workers (and Push) have been disabled in the Firefox 45 & 52 Extended Support Releases (ESR).