Re: [whatwg/fetch] keepalive: Do we need to restrict the number of requests at a time? (#662)

By per-tab, do you actually mean a unit of related browsing contexts? Otherwise `window.open()` / `<a target=x>` would be escapes (albeit somewhat guarded in most situations). It doesn't seem acceptable to not support them in service workers though. How would you pass such a request through otherwise?

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