Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is available in Web Workers.
The options read-only property of the PushSubscription interface is an object containing the options used to create the subscription.
A read-only PushSubscriptionOptions object containing the following values:
userVisibleOnlyA boolean, indicating that the returned push subscription will only be used for messages whose effect is made visible to the user.
applicationServerKeyA public key your push server will use to send messages to client apps via a push server. This value is part of a signing key pair generated by your application server, and usable with elliptic curve digital signature (ECDSA), over the P-256 curve.