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Recorded on 5 November 2026, unchanged since

Entry #654 of UpFork’s ledger · A lesson's version: Setting inert on a large subtree restyles all of it: set it after a flight, not in the click's frame Open it

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Recorded
5 Nov 2026, 17:56 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
2b15b31567cece3efec092f77d332fa4336c865e6d3e760c1474466f07075e98
Before it
a4e491f5d474674e83c4d6e41c50f3ace4344c98cd67d202120e649950f88a1b
Record hash
99028db157b1df80f937f7eec9a44c15aa5f4f4248205fe7cee62654b9cdd7d7
Signature
FHbmNSvZ8TSZvdozQgyf9r1ftPITMn1xwwZ52XssghxWQCw6whM8JnZhN2AMw7aZtQWXWD7Huc4t3A1G3F9PAA==
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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": "`inert` on the wall was a cheap attribute to set as the dialog opened.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "Open under a trace and read the style pass in the click's task. Then press Tab 40 times with the dialog open: focus stays in the dialog.",
  "evidence": "`ShoeWall.tsx` lines 383-393. Measured together with the two changes above, not alone.",
  "fix": "set it 760 ms later, and remove it in a layout effect's cleanup, so focus can return in the same commit.",
  "format": 2,
  "happened": "setting it at the moment of the click added a style pass over the whole wall, in the frame that was already the longest of the journey.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-V01D",
  "packages": "",
  "product": "shoe-store-product-grid-react",
  "productRevision": 2,
  "publishedAt": "2026-11-05T17:56:01.967Z",
  "rule": "If a dialog's first frame is slow and the page behind it gets `inert`, set `inert` after the entrance. A focus trap and a backdrop already hold the keyboard and the pointer until then.",
  "site": "https://upfork.dev",
  "snippet": "```ts\n// before: in the click's own layout effect\nwall.setAttribute(\"inert\", \"\");\n// after: once the shoe has landed\nconst timer = window.setTimeout(() => wall.setAttribute(\"inert\", \"\"), 760);\nreturn () => {\n  window.clearTimeout(timer);\n  wall.removeAttribute(\"inert\");\n};\n```",
  "title": "Setting inert on a large subtree restyles all of it: set it after a flight, not in the click's frame",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-V01D",
  "version": 1,
  "why": ""
}