Is service worker ready?

Is ServiceWorker ready?

Yes.

Service worker enthusiasm

The first thing any implementation needs.

Chrome

Supported

Firefox

Supported

Opera

Supported

Samsung Internet

Supported

Safari

Supported

Edge

Supported

Chrome: Shipped.
Firefox: Shipped.
Samsung Internet: Shipped. Based on Chromium 44.2403 with some additions and changes. (See "Service Worker" section.)
Safari: Shipped.
Edge: Shipped.
Support does not include iOS versions of third-party browsers on that platform (see Safari support).

Promises

Not service worker-specific, but required by service worker. Spec.

Chrome

Supported since version 36

Firefox

Supported since version 29

Opera

Supported since version 23

Samsung Internet

Supported since version 2

Safari

Supported since version 9

Edge

Supported since version 13

Debugging

State of debugging tools.

Chrome

Supported since version 40

Firefox

Supported since version 47

Opera

Supported

Samsung Internet

Supported

Safari

Supported since version 11.1

Edge

Supported since version 17

Chrome: You can debug service worker scripts as any other. "Application" panel in devtools has service worker & cache sections.
Firefox: Debuggable from the "Workers" page in about:debugging.
Firefox: Web Console can display console messages from service workers.
Firefox: about:serviceworkers has some under-the-hood stuff.
Opera: Debuggable from the resources panel in Opera developer if you enable super-experimental devtools.
Opera: Console messages from the service worker appear in the pages' console in Opera stable.
Safari: See 'service workers' in the 'develop' menu to open an inspector for a particular service worker.
Edge: See the service worker section in the sources panel.
Chrome & Opera: Debuggable from the resources panel in Chrome Canary and Opera developer if you enable super-experimental devtools.
Chrome & Opera: Console messages from the service worker appear in the pages' console.
Chrome & Opera & Samsung Internet: chrome://serviceworker-internals resp. browser://serviceworker-internals (in Opera developer) has some under-the-hood stuff.

`navigator.serviceWorker`

Namespace for page-side service worker API. Spec. Test.

Chrome

Supported since version 40

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

Register / unregister

Chrome

Supported since version 40

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

`postMessage` to & from worker

Spec. Test.

Chrome

Supported since version 45

Firefox

Supported since version 44

Opera

Supported since version 32

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

Fetch event

Fires for pages and all sub-resources. Spec. Test.

Chrome

Supported since version 40

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

`fetchEvent.request`

Spec. Test.

Chrome

Supported since version 40

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

`fetchEvent.respondWith()`

Spec. Test.

Chrome

Supported since version 40

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

Install event

Install event fires in a newly discovered SW. Includes InstallEvent.waitUntil(). Spec. Test

Chrome

Supported since version 40

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

`self.skipWaiting()`

Allow an installing worker to take over from the current active worker once installed. Spec. Test.

Chrome

Supported since version 42

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

Activate event

Activate event fires once this worker becomes the active worker in a registration. Includes event.waitUntil(). Spec. Test.

Chrome

Supported since version 40

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

`clients.claim()`

Allow an active worker to take control of pages in its scope (eg, documents that were loaded before the SW was registered). Spec. Test.

Chrome

Supported since version 42

Firefox

Supported since version 44

Opera

Supported since version 33

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

Update checks

Browser checks for SW updates after navigation. Spec.

Chrome

Supported since version 40

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

Service worker lifecycle

Allow a next version to be in waiting & take over when appropriate.

Chrome

Supported since version 40

Firefox

Supported since version 44

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

`Request`

Spec. Test.

Chrome

Supported since version 40

Firefox

Supported since version 39

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 10.1

Edge

Supported since version 14

`Response`

Spec. Test.

Chrome

Supported since version 40

Firefox

Supported since version 39

Opera

Supported since version 33

Samsung Internet

Supported since version 4

Safari

Supported since version 10.1

Edge

Supported since version 14

Chrome & Samsung Internet: URLSearchParams not supported yet

`fetch(request)`

Spec. Test.

Chrome

Supported since version 40

Firefox

Supported since version 39

Opera

Supported since version 27

Samsung Internet

Supported since version 4

Safari

Supported since version 10.1

Edge

Supported since version 14

Polyfill available

`caches`

Spec. Test.

Chrome

Supported since version 46

Firefox

Supported since version 44

Opera

Supported since version 33

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 16

`serviceWorker.ready`

Spec. Test.

Chrome

Supported

Firefox

Supported since version 44

Opera

Supported since version 33

Samsung Internet

Supported since version 4

Safari

Supported since version 11.1

Edge

Supported since version 17

Background sync

Deferring tasks until the user has connectivity. Spec. Test.

Chrome

Supported since version 49

Firefox

No support

Opera

No support

Samsung Internet

No support

Safari

No support

Edge

No support

Firefox: Bug 1217544
Edge: In development

Service worker is here. Get busy with it.