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Entry #718 of UpFork’s ledger · A lesson's version: A key used to replay an animation remounted the size tiles and dropped keyboard focus: use element.animate() Open it

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Recorded
5 Nov 2026, 22:02 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
5d3df3db74395b3d5834509e3bff66ba5b743e8b9b087b72d7f06a897257c2cf
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fbb9e9a33c6c63117e7f9e075eaca9ee8c03bb85f051fea134f2e9d80aa86904
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47893e458566846fb131d920a27cb8ca186f4105abce0fcef3c1823c1548e8af
Signature
r42ndwpAo1tuUc6I3jgbetq0v73H8T862BrlQ6ICUDxIj7TCujt7mc98g6Qs72Ox5DmjgQU2ZQysWy+c5Z2qBA==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: React components that replay an animation by changing key",
  "article": "a-camera-that-walks-up-to-a-shoe-springs-buying-inside-a-3d-room-and-a-wall",
  "articleRevision": 1,
  "assumed": "a key was the simplest way to replay a CSS animation.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "press Add with no size chosen: focus lands on a size tile and is still there after the pulse (`document.activeElement` is that tile, not `body`).",
  "evidence": "commit 0951249.",
  "fix": "a one-off `element.animate()`. Nothing in React changes, so nothing loses its place.",
  "format": 2,
  "happened": "the click moved focus to a tile, then React remounted the tiles under it and focus fell to the page.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-EN2W",
  "packages": "",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 1,
  "publishedAt": "2026-11-05T22:01:52.493Z",
  "rule": "If a React `key` change replays an animation on controls that may hold focus, play it with `element.animate()` instead: a new key remounts the elements and focus falls to the page.",
  "site": "https://upfork.dev",
  "snippet": "```tsx\nimport { useEffect, useRef } from \"react\";\n// before: <SizeTiles key={pulse} ... /> to replay a CSS pulse, which remounted every tile under the focus\nexport function useNudge(pulse: number) {\n  const group = useRef<HTMLDivElement>(null);\n  useEffect(() => {\n    if (pulse <= 0) return;\n    const a = group.current?.animate(\n      [{ transform: \"none\" }, { transform: \"translate3d(0,-2px,0) scale(1.012)\", offset: 0.4 }, { transform: \"none\" }],\n      { duration: 500, easing: \"cubic-bezier(0.22,0.8,0.24,1)\" },\n    );\n    return () => a?.cancel();\n  }, [pulse]);\n  return group; // <div ref={group} role=\"radiogroup\"> ...tiles... </div>\n}\n```",
  "title": "A key used to replay an animation remounted the size tiles and dropped keyboard focus: use element.animate()",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-EN2W",
  "version": 1,
  "why": ""
}