web-feature: Service workers

baseline logo Widely available in browsers but not in WebViews

The service worker of a website is a script that runs in its own thread and which acts as local proxy that intercepts network requests from the website. Use a service worker to implement advanced caching strategies, offline support, background tasks, or push notification support on your website.

WKWebView

macOS

*

iOS

*

Android WebView

Android

*

WebView2

Windows

*

Chrome Browser

Android

45

Safari Browser

iOS

11.3

Notes

Unsupported keys in WebViews

  • WKWebView:
    api.Client api.Client.frameType api.Client.id api.Client.postMessage api.Client.type api.Client.url api.Clients api.Clients.claim api.Clients.get api.Clients.matchAll api.Clients.matchAll.options_includeUncontrolled_parameter api.Clients.openWindow api.ExtendableEvent api.ExtendableEvent.ExtendableEvent api.ExtendableEvent.waitUntil api.ExtendableEvent.waitUntil.async_waitUntil api.ExtendableMessageEvent api.ExtendableMessageEvent.ExtendableMessageEvent api.ExtendableMessageEvent.data api.ExtendableMessageEvent.lastEventId api.ExtendableMessageEvent.origin api.ExtendableMessageEvent.ports api.ExtendableMessageEvent.source api.FetchEvent api.FetchEvent.FetchEvent api.FetchEvent.clientId api.FetchEvent.handled api.FetchEvent.preloadResponse api.FetchEvent.request api.FetchEvent.respondWith api.FetchEvent.resultingClientId api.InstallEvent api.Navigator.serviceWorker api.ServiceWorker api.ServiceWorker.postMessage api.ServiceWorker.scriptURL api.ServiceWorker.state api.ServiceWorker.statechange_event api.ServiceWorkerContainer api.ServiceWorkerContainer.controller api.ServiceWorkerContainer.controllerchange_event api.ServiceWorkerContainer.getRegistration api.ServiceWorkerContainer.getRegistrations api.ServiceWorkerContainer.message_event api.ServiceWorkerContainer.ready api.ServiceWorkerContainer.register api.ServiceWorkerContainer.startMessages api.ServiceWorkerContainer.worker_support api.ServiceWorkerGlobalScope api.ServiceWorkerGlobalScope.activate_event api.ServiceWorkerGlobalScope.clients api.ServiceWorkerGlobalScope.fetch_event api.ServiceWorkerGlobalScope.install_event api.ServiceWorkerGlobalScope.message_event api.ServiceWorkerGlobalScope.registration api.ServiceWorkerGlobalScope.serviceWorker api.ServiceWorkerGlobalScope.skipWaiting api.ServiceWorkerRegistration.active api.ServiceWorkerRegistration.installing api.ServiceWorkerRegistration.navigationPreload api.ServiceWorkerRegistration.scope api.ServiceWorkerRegistration.unregister api.ServiceWorkerRegistration.update api.ServiceWorkerRegistration.updateViaCache api.ServiceWorkerRegistration.updatefound_event api.ServiceWorkerRegistration.waiting api.WindowClient api.WindowClient.ancestorOrigins api.WindowClient.focus api.WindowClient.focused api.WindowClient.navigate api.WindowClient.visibilityState api.WorkerNavigator.serviceWorker

Support data provided by: BCD logo

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This feature was last updated on November 10, 2025.