When offline it should be possible to view previously loaded Wikipedia articles.
This would allow people to open Wikipedia articles when there is WiFi and then take them to places where there is no internet available for educational purposes.

I would suggest we make the last 10 viewed web pages available using a network first load strategy.

A proof of concept is here: https://gerrit.wikimedia.org/r/273388

In T101731, @Gilles wrote:

This is a meta-task to brainstorm actual tasks that could use Service Workers with the hope of improving page-load performance.

• https://github.com/jakearchibald/offline-wikipedia
• https://wiki-offline.jakearchibald.com/
• http://jakearchibald.com/2014/offline-cookbook/
• https://twitter.com/jaffathecake/status/604665605082333185