The registration read-only property of the ServiceWorkerGlobalScope interface returns a reference to the ServiceWorkerRegistration object, which represents the service worker's registration.
The registration read-only property of the ServiceWorkerGlobalScope interface returns a reference to the ServiceWorkerRegistration object, which represents the service worker's registration.
A ServiceWorkerRegistration object.
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    https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope/registration