Re: [whatwg/fetch] Deferred fetching (PR #1647)

> When is UA allowed to trigger fetchLater? 

- If the page is fully active, at least after the timeout/deadline
- If there is reason to believe the UA/document is going to terminate, ASAP
- + dome delta for batching/throttling

> Especially on mobile one could have a page in a background tab for quite some time doing nothing (since it is throttled so heavily), but still having the current active document. Is there a reason to keep fetchLater waiting for basically forever in that case?

The UA is allowed to activate them if there's a good reason to believe that the page might never become active.

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