Re: [w3c/ServiceWorker] Add Request Soft Update algorithm for use by other specifications (PR #1847)

@yoshisatoyanagisawa commented on this pull request.



> @@ -2928,6 +2928,24 @@ spec: storage; urlPrefix: https://storage.spec.whatwg.org/
       1. Invoke <a>Schedule Job</a> with |job|.
   </section>
 
+  <section algorithm>
+    <h3 id="request-soft-update-algorithm"><dfn export>Request Soft Update</dfn></h3>
+
+    This algorithm allows other specifications to request that the user agent check a [=/service worker registration=] for updates.
+
+      : Input
+      :: |registration|, a [=/service worker registration=]
+      :: |requestingStorageKey|, a [=/storage key=]
+      : Output
+      :: None
+
+      1. If |registration|'s [=service worker registration/storage key=] is not [=storage key/equal=] to |requestingStorageKey|, return.
+      1. The user agent *may* return.

Expect Note here to tell what situation the browser may return here, or write the algorithm like: `If the user agent decides to limit the frequency of update checks, return.` to clarify the condition.

(Yeah, I mean that instead of having one large note below, I suggest to bring relevant part here.)

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