Re: [w3c/ServiceWorker] what happens if an initial about:blank inherits a controller, but its navigation request does not match any service worker? (#1232)

I suspect not reusing the global in this case should be OK.

The other option would be to try to change the spec model of iframe loading such that the case above creates a document with the `scope2/index.html` URL to start with, and it's not controlled to start with.  I believe that IE/Edge do something like that.  Doing that would require some careful thought and compat testing and so forth though....

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