ON ANIMATING WHAT YOU CAN'T SEE

Summary from the TLDR Design newsletter

A ghosted double image in DuckDuckGo for iOS's floating toolbar survived three rounds of retiming because the bug was view ownership, not animation timing. Recording the transition at 60fps and stepping through it with ffmpeg showed the tab-count badge fully visible 24 frames before the snapshot animation began. Two failure modes generalize: snapshotting a view's bounds instead of what it draws, and resizing a snapshot instead of scaling it.