Re: [csswg-drafts] [css-anchor-position-1] Interaction between trying position options and CSS transitions (#13048)

I don't understand the animations section https://drafts.csswg.org/css-anchor-position-1/#suspending-fallback-animations

Today, animations produce a current value that is interpolated between its specified keyframes and feeds into the cascade. The impact on fallback selection normally follows this. What do you mean by suspending determining position fallback styles? Do you want an element to animate to a place that it does not fit and then trigger a fallback position update?

The OP talks about transitions, however much of the discussion is about animations. These two things are handled very differently. Transitions endpoints are determined after a computed style change, but animations do not evaluate their keyframes or endpoints - only the current point in time. For transitions I could see how since the new value applies and we determine from the after-change style that a transition is to be started that we might be able to use the resulting position fallback.

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Received on Tuesday, 6 January 2026 18:34:55 UTC