Re: [w3c/ServiceWorker] should FetchEvent.request.signal reflect abort status of outer request? (#1544)

> E.g., I don't think the server worker knows if fetches are getting terminated when a document is unloaded.

If we surfaced internal abort reasons on the exposed signal it would satisfy this case.

FWIW, the context for why I was looking at this was that I wanted to write a test showing cache.addAll() aborted outstanding requests when one failed.  But it seems impossible to do so in WPT right now.

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