Re: [w3c/ServiceWorker] Improve handling of extend lifetime promises (#1049)

domenic commented on this pull request.



>        The user agent *should not* <a lt="terminate service worker">terminate</a> the [=/service worker=] associated with |event|'s <a>relevant settings object</a>'s [=environment settings object/global object=] until |event|'s <a>extensions allowed flag</a> is unset. However, the user agent *may* impose a time limit to this lifetime extension.
   </section>
 
   <section algorithm>
+    <h3 id="handle-extend-lifetime-promise-algorithm"><dfn>Handle Extend Lifetime Promise</dfn></h3>
+
+      : Input
+      :: |event|, an {{ExtendableEvent}} object
+      :: |promise|, a [=promise=]
+      : Output
+      :: None
+
+      1. Wait until |promise| is settled [=in parallel=].
+      2. [=Queue a microtask=] to run the following substeps:

Wait, why is that? Microtasks are just a type of task, in general, so I thought this would work.

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https://github.com/w3c/ServiceWorker/pull/1049