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

@mingyc commented on this pull request.



> @@ -8449,6 +8597,60 @@ with a <var>promise</var>, <var>request</var>, <var>responseObject</var>, and an
 </div>
 
 
+<h3 id=fetch-later-method>FetchLater method</h3>
+
+<pre class=idl>
+
+dictionary DeferredRequestInit : RequestInit {
+  DOMHighResTimeStamp backgroundTimeout;
+};
+
+partial interface mixin WindowOrWorkerGlobalScope {
+  [NewObject] Promise&lt;Response> fetchLater(RequestInfo input, optional DeferredRequestInit init = {});

But this should not be optional as `fetchLater()` should always return `FetchLaterState` for user to tell if it is `sent` (or `pending`) later?

> having the signature be DeferredFetchResult fetchLater(...), where DeferredFetchResult has a { sent: false } that turns to true synchronously at the appropriate moment? 

I don't quite get the synchronous part, how could `FetchLaterState` update itself?

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