[csswg-drafts] Anchor positioning, should the fallbacks re-calculate to respect my default? (#13573)

brechtDR has just created a new issue for https://github.com/w3c/csswg-drafts:

== Anchor positioning, should the fallbacks re-calculate to respect my default? ==
When creating a simple anchoring demo where I can use position-try-fallbacks. I notice that there isn't a re-calculation on each step. 

In the following example, my default is showing the popover at the top, which, as an author, is my preferred way. When switching the position around, if it goes from the bottom and the center option can be shown as bottom, it doesn't bother to recalculate, which I probably want it to do. I want it to respect my default in the design.

It's easier to illustrate the issue on video...

https://github.com/user-attachments/assets/ec393f23-570e-4445-8047-cbc50814268a

Here is the Codepen:
https://codepen.io/utilitybend/pen/OPMRXqE

I am aware this is probably by design to not have unnecessary calculations, but I wonder if this is the right call from a "UI design" point of view.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/13573 using your GitHub account


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Received on Friday, 27 February 2026 14:47:55 UTC