Re: [ServiceWorker] Should skipWaiting() wait for an "in-progress request" to finish? (#569)

A default behavior for each functional event seems like a reasonable option I guess. For fetch, no `e.respondWith()` within the event handlers triggers network fetch. And we also allow `e.preventDefault()` to explicitly cancel the default behavior.

In that sense, fallback to network sounds good to me (maybe under the condition that the event's canceled flag is unset at the time of the termination.) Dispatching another event seems like a bit magical.

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