Re: [w3c/ServiceWorker] activation of the Service Worker on an iframe context (#1029)

You are right. If the `domain.com` Service Worker has a `fetch` event listener, then it will be **running** (even on Chrome 54).

So it is fair to say that the iframe context **was not** an element to be considered, and was due to the **optimization** underlined by @mattto. (The _Fetch Handler Existence_ was not available on our Chrome 54, we had to check it on a more recent version)

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