I get this:
Refused to execute script from 'https://raw.githubusercontent.com/nezasa/iso8601-js-period/master/iso8601.min.js' because its MIME type ('text/plain') is not executable, and strict MIME type checking is enabled.
Which seems kinda reasonable to me. Would it not be safer to vendor the minified js into folium?
Thanks for the report. I will take a look at some alternatives.
I haven't tested, but I'm guessing that "chrome" probably means any modern browser, as, from what I read, github is now passing a header that causes modern browsers to not load a file with mimetype text as js.
Most helpful comment
https://github.com/python-visualization/folium/pull/440 Fixed this