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The ExtendableEvent interface extends the lifetime of the install and activate events dispatched on the global scope as part of the service worker lifecycle. This ensures that any functional events (like FetchEvent) are not dispatched until it upgrades database schemas and deletes the outdated cache entries.
API Experimental ExtendableEvent Interface Offline offline Reference Service Workers ServiceWorker Workers


The focused read-only property of the WindowClient interface is a Boolean that indicates whether the current client has focus.
API Experimental Expérimental focused Property Reference Référence Service Workers ServiceWorker WindowClient