Update to new ServiceWorker spec link
diff --git a/docs/_writing-tests/testharness-api.md b/docs/_writing-tests/testharness-api.md
index e7e53e4..5d23e25 100644
--- a/docs/_writing-tests/testharness-api.md
+++ b/docs/_writing-tests/testharness-api.md
@@ -434,7 +434,7 @@
Dedicated and shared workers don't have an event that corresponds to the `load`
event in a document. Therefore these worker tests always behave as if the
`explicit_done` property is set to true. Service workers depend on the
-[install](https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-global-scope-install-event)
+[install](https://w3c.github.io/ServiceWorker/#service-worker-global-scope-install-event)
event which is fired following the completion of [running the
worker](https://html.spec.whatwg.org/multipage/workers.html#run-a-worker).
@@ -610,7 +610,7 @@
The `testharness.js` script can be used from within [dedicated workers, shared
workers](https://html.spec.whatwg.org/multipage/workers.html) and [service
-workers](https://slightlyoff.github.io/ServiceWorker/spec/service_worker/).
+workers](https://w3c.github.io/ServiceWorker/).
Testing from a worker script is different from testing from an HTML document in
several ways:
@@ -637,7 +637,7 @@
complete](#determining-when-all-tests-are-complete)). So these worker tests
behave as if they were started with the `explicit_done` option. Service
workers depend on the
- [oninstall](https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-global-scope-install-event)
+ [oninstall](https://w3c.github.io/ServiceWorker/#service-worker-global-scope-install-event)
event and don't require an explicit `done` call.
Here's an example that uses a dedicated worker.
@@ -674,7 +674,7 @@
The argument to the `fetch_tests_from_worker` function can be a
[`Worker`](https://html.spec.whatwg.org/multipage/workers.html#dedicated-workers-and-the-worker-interface),
a [`SharedWorker`](https://html.spec.whatwg.org/multipage/workers.html#shared-workers-and-the-sharedworker-interface)
-or a [`ServiceWorker`](https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#service-worker-obj).
+or a [`ServiceWorker`](https://w3c.github.io/ServiceWorker/#serviceworker-interface).
Once called, the containing document fetches all the tests from the worker and
behaves as if those tests were running in the containing document itself.
