Offline support for internet outages

[tomlarkworthy]

Is your feature request related to a problem? Please describe. When the internet breaks, the notebook breaks. Happens occasionally during day-to-day activities but also seems to strike a fair amount during Twitch streams when people's internet is under extra pressure.

Describe the solution you'd like Basic: Service Workers to the rescue! Serve from the cache if the internet is not around so you can still view things. Advanced: Buffer up writes locally for when the internet is online so you can continue to work

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context it is not a very high priority for me personally but it would make the product better IMHO and make the streams go a little smoother sometimes I think.

[ghing]

I want to give this a +1. Traveling to the NICAR conference by train and at the conference where the wifi could be shaky, this would have been important to me. Until there is first-class support for this, I'd like to see:

• Clearer error messages/documentation about what changes are or aren't saved when working offline and what happens when the connection comes back up. I know this is documented somewhat, but if you get the warning modal, it's not clear what to expect.
• Clearer documentation about how attachments are handled without the internet
• Sample snippets for fetching data from a local webserver as a fallback if an internet connection is unavailable.