Thanks to a quick tip and advice from @adactio, I was able to improve my offline support here @IndieWebCamp SF in the last 15 minutes!

I started with the script for listing offline cache available pages from https://clearleft.com/offline, stripped it down a bit, and filtered for / or .html files.

Now when you load my site when offline, you’ll see what pages you have cached and can view while offline!

on (ttk.me t53y1) using BBEdit