[csswg-drafts] [css-anchor-position-1] `position-fallback-bounds` vs `position-container` (#9868)

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

== [css-anchor-position-1] `position-fallback-bounds` vs `position-container` ==
Afaict `position-fallback-bounds` only affects whether the abspos is considered to overflow for the purposes of triggering fallback positions.

I'm having a hard time understanding what use case it might have that wouldn't be covered by a `position-container` that actually changes the containing block (and would have many more use cases besides, see e.g. #9662 and the Apple proposal which approximated this using anchor positioning).

Assuming that a fixedpos would continue to check its overflow against the viewport in addition to its containing block, do we really need both of these features?

CC @una

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/9868 using your GitHub account


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Received on Saturday, 27 January 2024 01:50:11 UTC