Re: [w3c/ServiceWorker] Don't fail update upon error fetching the incumbent worker's import s… (#1377)

jakearchibald approved this pull request.

One minor nit, otherwise LGTM

> @@ -163,13 +163,17 @@ spec: webappsec-referrer-policy; urlPrefix: https://w3c.github.io/webappsec-refe
 
     A [=/service worker=] has an associated <dfn export id="dfn-script-resource-map">script resource map</dfn> which is an <a>ordered map</a> where the keys are [=/URLs=] and the values are [=/responses=].
 
+    A [=/service worker=] has an associated  <dfn export id="dfn-set-of-used-scripts">set of used scripts</dfn> (a [=ordered set|set=]) whose [=list/item=] is a [=/URL=]. It is initially empty.

I think "It is initially a new [=ordered set|set=]" is the correct language here (and below).

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