Re: [slightlyoff/ServiceWorker] Make ServiceWorkers more tailored for "always offline" websites (#907)

> It might make sense to allow workers to ask for "persistent mode".

This is part of the storage spec https://storage.spec.whatwg.org/#persistence and is in development in Chrome. https://www.chromestatus.com/feature/5715811364765696

> or when user clears their cache — similar to IndexedDB data that is persisted across clearing caches

Service workers and the cache API shouldn't clear independently of IndexedDB - do you have an example of this happening?

> I propose to make it possible to register service worker for different domain than it is being accessed from

Pretty sure we'll never do this as it turns a minor XSS into a huge long-term breakage.

For the use-case presented, if another origin is able to provide the SW, and presumably therefore the data of the original, it's more like a mirror or simply a "move". In that case it should just work as it does today, just install the app from another site.

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