Re: [whatwg/dom] Change add/remove event listener behavior for service workers (#653)

jungkees commented on this pull request.



> -  object and its associated <a>service worker</a>'s <a for="service worker">script resource</a>'s
-  <a for="script resource">has ever been evaluated flag</a> is set, then <a>throw</a> a
-  <code>TypeError</code>.
-  [[!SERVICE-WORKERS]]
-
-  <p class="note no-backref">To optimize storing the event types allowed for the service worker and
-  to avoid non-deterministic changes to the event listeners, invocation of the method is allowed
-  only during the very first evaluation of the service worker script.
+  <p>If <var>eventTarget</var> is a {{ServiceWorkerGlobalScope}} object and its associated
+  <a>service worker</a>'s <a for="service worker">script resource</a>'s
+  <a for="script resource">has ever been evaluated flag</a> is set, then
+  <a>report a warning to the console</a> with a description explaining that the
+  <a>service worker event</a> is to be added synchronously, otherwise the user agent will not start
+  the <a>service worker</a> for the <a>event</a>. [[!SERVICE-WORKERS]]
+
+  <p class="note no-backref">To optimize with the set of <a>service worker events</a> to handle,

I tried to rephrase the note by using "deterministically added .. during the very first script evaluation".

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