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Open Letter to Tim Cook: Sabotaging Web Apps Is Indefensible
(letter.open-web-advocacy.org)
A place to discuss the news and latest developments on the open-source browser Firefox
The distinction is web workers and offline mode.
It means your PWA can preload everything it needs to run offline, and you can actually use it offline. That is different from a "cached website" which can only cache the pages you've already visited and otherwise does not allow you to update data locally.
Your website can just preload all pages needed for offline mode