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

jungkees commented on this pull request.



> @@ -1118,11 +1120,12 @@ and an <a>event listener</a> <var>listener</var>, set <var>listener</var>'s
 method, when invoked, must run these steps:
 
 <ol>
- <li><p>If the <a>context object</a>'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]]
+ <li><p>If the <a>context 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>report a warning to the console</a> with a description explaining that the user agent will still
+ start the <a>service worker</a> for the <a>service worker event</a> that was synchronously added.

We are able to know whether the event has been added to the service worker's *set of event types to handle*. But I thought that we'd want to show the warning message when the function is called outside of the first evaluation regardless of whether the event has been added synchronously.

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