Re: [ServiceWorker] Interception of the fallback requests initiated from a SW for cross-origin resources (#684)

>  is your proposal that https://font-service/sw.js would only be allowed to intercept requests from service workers (and their controlled pages) that explicitly called registerExternal for that service?

That was my thinking. But at a minimum (if we have this feature) I should be able to specify another service as an install dependency.

> there already is a problem with things like social network "like" buttons, ads, and probably many more things that are typically implemented with iframes, which all potentially can have their own service workers.

Should we be adding to that problem?

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