None of the demos work in Firefox or Safari when running locally using the dev server

[haach]

Hey! I wanted to use this polyfill in my library, but when I fired up the demos locally, I noticed that none of them work properly in either OSx Firefox or Safari. On Chrome everything appears to work as expected as far as I can tell.

I am on macOS Ventura (13.6.6)

Here are some recordings:

Chrome, Version 124.0.6367.158 https://github.com/flackr/scroll-timeline/assets/34210193/f2688d5e-8d80-428b-b532-6fb1966765ba

Firefox, version 106.0.1 https://github.com/flackr/scroll-timeline/assets/34210193/06cfab04-253a-4974-b65c-9dd86d51c413

Safari, Version 17.4.1 https://github.com/flackr/scroll-timeline/assets/34210193/feba95f6-ddd6-4415-88c9-d9f870d60fda

Has anyone else ran into a similar issue? I am interested in the scroll( ) function polyfill