I've put together an example here but it doesn't seem to work in Firefox 151.0.2 (64-bit): https://favs.eu.org/parallax/
Edit: if the body has class="no-sda", it uses a js fallback.
Edit: if the body has class="no-sda", it uses a js fallback.
You did leave that part out of your recipe though. Would you mind adding it there, so that people who copy paste are more inclined to actually keep/use that part as well?
Mac on latest chrome.
and how do I know if I'm hitting the fallback?