Baseline 2023
Newly available
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 expirationTime read-only property of the PushSubscription interface returns a DOMHighResTimeStamp of the subscription expiration time associated with the push subscription, if there is one, or null otherwise.
A DOMHighResTimeStamp or null.
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