This is exactly what I was looking for. Thanks.

Dear dev,
THANK YOU SO MUCH!
i simply can't believe that this extension is not more popular!
and thank you for being thoughtful enough to avoid using javascript for the case when javascript might be disabled... you are such an angel!

Works Well & Quickly. I appreciate that it restricts data access to downloaded events and associated history only as seems to be the case. Good Clean Coder. Thanks Brother

This is without any doubt the most ingenious use of 'refresh' I ever saw. (And I've been building sites from the beginning.)
This extension is so simple it's brilliant. Because it's so simple, nothing can go wrong.
Until a few years ago there was an extension to make a simple link on a Linux computer. That didn't work anymore. This extension is even more brilliant.

This is a novel and great idea, and very well implemented. I'd only add the ability to customize the name of the HTML file.