Re: [ServiceWorker] HTTP authentication and proxy authentication hook (#119)

>From IRC discussion:

If `fetch(url)` is initiated from a dedicated worker or document, it can use the top level window of the associated document for UI if required.

For `fetch(url)` within SharedWorkers, UI should be shown in the top level window associated with one of the associated documents of the SharedWorker.

For `fetch(url)` within ServiceWorker, UI should be shown in the top level window associated with one of the controlled window clients.

In cases where there are multiple choices, the browser should prioritise focused windows, over visible windows, over others.

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https://github.com/slightlyoff/ServiceWorker/issues/119#issuecomment-118308859