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I have been wondering, since PWA are sandboxed and all, would it be possible to save a "snapshot" of it and be able to run it even if the original website/app went offline?

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That’s left entirely to the developer to decide. You can intercept your network requests with a service worker and decide what to do from there [1].

[1] https://livebook.manning.com/book/progressive-web-apps/chapt...

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