Re: [w3c/ServiceWorker] should an window.open() about:blank document be controlled by opener's controller? (#1163)

asutherland left a comment (w3c/ServiceWorker#1163)

Do we think the (post-2017 text) at https://w3c.github.io/ServiceWorker/#control-and-use-window-client doesn't cover this already?  I think I had read it as covering this when I'd most recently read, but I also was reading assuming the inheriting happened.  (cc gecko about:blank expert @vinhill)

Aside: Gecko definitely has implemented the inheriting of the controller from a controlled window using window.open() into the opened about:blank.  (That said, it has been a source of frustration in terms of anti-tracking heuristics impacting partitioning since the resulting browsing context is at once top-level as well as being an auxiliary browsing context/having an opener.  (xref https://github.com/whatwg/html/issues/5680)

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