[chao-]

I am also struggling to see what clicking any of the options in the demo changes. I don't consider myself advanced in design knowledge, but I'm pretty average in visual perception.

Perhaps some or all of them don't work in Firefox for Android, and I'm just seeing a fallback behavior that does work?

Edit: Just tested in Chrome desktop and Firefox desktop on Linux, still struggling to see a difference in any of the demo regions (which I assume are supposed to demo the option when selected?). Also scroll behavior is graphically laggy/jumpy in Chrome, but not Firefox.