How we made the RioRun progressive web app | Info | The Guardian
The devs at The Guardian walk through the process of building a progressive web app for the Olympics. There were some gotchas with the life cycle of service workers, but the pay-off was worth it:
Once you get there though, it’s quite magical when you load the page on a phone, switch it to airplane mode, reload, and continue using the app as though nothing was wrong.