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Ah, I think I tested with version 147 (the latest one), which came out early January. Before 147, anchor positioning isn't available. Or at least, not enough for the demo to run. While working on this, I did uncover a crashing bug too, so some instability is expected. This is cutting edge stuff.

the parallax animation the web has been needing

In this, I'm only moving the red popup, all the other ones follow directly or indirectly via CSS anchor positioning.

love the "whack a dialog" demo 😅 reminded me of this one i did for CSS day with [popover] 🎈 so true though, fun experimentation has multiple benefits 💯 not only do you learn something, but it's also great for finding API limits or surfacing browser bugs/issues, wish we saw more of it!

I'm looking forward to in 5 years for new sites to still be using some React only library that uses JS to do this anyways.

Love it!