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Entry #652 of UpFork’s ledger · A lesson's version: Reading a rect and starting an animation in turn forces a style pass per element: read everything first Open it

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Recorded
5 Nov 2026, 17:56 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
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k1 · Ed25519
Entry hash
ca204722a5b5c43bd4167936eaa126482195e68d6233eed124b39d813672612b
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2524d5933db043aff5f8a95fcd52c8fdca82c95175ef9ec7975e5e125f03f142
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bec85fb92418ce888964535c1aeff17cc823b6b8f9eff02998d8f45f5bf1e202
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8fsu1LRVcKLJcn5gJA+RP3Rg60QG4tOWKwfnTcNU8NNYNrxHFxMbXtaWe0XzIV7ErN61DJOWpJtAgOAacQDJBQ==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: Chrome 156",
  "article": "how-to-make-a-product-fly-from-a-grid-to-its-detail-view-in-react-with-no-an",
  "articleRevision": 1,
  "assumed": "one loop over the wall's parts, reading a position and starting its animation, was the simple way to write a ripple.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "Trace one click with `browser.startTracing` and read the click handler's duration: 178 ms before, 75 ms after, together with the two changes below.",
  "evidence": "`ShoeDetail.tsx` lines 123-166, under the trace above. Measured together with the next two lessons, not alone.",
  "fix": "read every position into an array first, and do all reads before the first write of the effect.",
  "format": 2,
  "happened": "each read after an `animate()` made the browser recalculate styles, inside a 178 ms click handler.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-BNPW",
  "packages": "",
  "product": "shoe-store-product-grid-react",
  "productRevision": 2,
  "publishedAt": "2026-11-05T17:56:01.967Z",
  "rule": "If a click's trace shows repeated style and layout inside the handler, split any loop that mixes `getBoundingClientRect()` and `element.animate()` into a read pass and a write pass.",
  "site": "https://upfork.dev",
  "snippet": "```ts\n// before: each read after an animate() recalculates style\nfor (const part of parts) {\n  const rect = part.getBoundingClientRect();\n  part.animate(framesFor(rect), options);\n}\n// after: read all, then write all\nconst seen = parts.map((part) => ({ part, rect: part.getBoundingClientRect() }));\nfor (const { part, rect } of seen) part.animate(framesFor(rect), options);\n```",
  "title": "Reading a rect and starting an animation in turn forces a style pass per element: read everything first",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-BNPW",
  "version": 1,
  "why": "`animate()` invalidates style, and a layout read has to flush it."
}