Re: [w3c/ServiceWorker] `<iframe sandbox />` + SW (#1390)

> Why aren't the fetch events triggered for iframes without a src attribute?

You are running into implementation bugs.  The parent service worker should be inherited for about:blank, srcdoc, and blob URL iframes.  For example, the relevant chromium bug is:

https://crbug.com/880768

I think firefox is the only browser that does any inheritance of the service worker in these cases at the moment.

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