Oh that's weird ! I'm using :
Samsung Galaxy 8+
Chrome 79
Android 9
Thanks for pointing me out to background-attachment, I indeed didn't know !
Sadly though, from the example I started from, it kinda looked mandatory for correct positioning (but again, I'm newbie when it comes to CSS).
It's also confusing because https://caniuse.com/#feat=background-attachment states it as supported on Chrome for Android 79.
Thanks a lot for your amazing work, support and being so reactive ?
If you allow me one more question, does the way I use repeatRefresh with a function is a proper way to do with GSAP ?