It’s a generally good thing to know that browser support for browser features isn’t always quite a simple as yes or no. There can be sub-features involved as things evolve that roll out in browsers at different times. View Transitions is an example of that going on right now. There are “Same-Document View Transitions” supported in all browsers right now, but “Cross-Document View Transitions” are still missing Firefox support. And there are quite a few more related features beyond that! Bramus has a nice way to explore that.
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In-N-Out Animation using sibling-index()
Temani mimics a View Transition by placing items using their index and translations. The placement calculation change when the index changes, which is an animation opportunity!