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

jungkees commented on this pull request.



> @@ -1062,15 +1062,17 @@ and an <a>event listener</a> <var>listener</var>, run these steps:
 
 <ol>
  <li>
-  <p>If <var>eventTarget</var>'s <a>relevant global object</a> 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>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 the user agent must <a>report a warning to the
+  console</a> with a description explaining that the <a>service worker event</a> should be added

Done.

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