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Recorded on 5 November 2026, unchanged since

Entry #728 of UpFork’s ledger · A lesson's version: Focus sent into a list that is still inert goes nowhere: move it after the state that lifts inert commits Open it

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Recorded
5 Nov 2026, 22:02 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
57a5b7c8a02bfe7b93d3dc420092309a19f9861f3e048e471aeae6beab97b73f
Before it
dfc450ffdb528d48e198f003d1ae152be62fdb2db2d6193e8a738a150915d556
Record hash
96fa636fe782f140b6264073a3d04228b5419ebe5cd58003cc2cc2eee6b001a3
Signature
KZK939jC7P01+v6j7HrPJyGchk6bmPmopHAtRPvOoRTN3AbgwZZgDEGAV4pRiliIG6sbkjYN/lPEdhvqvVx5BQ==
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Record format 2 (signed since the change on 2026-10-30): the author is named by account number alone; the handle beside it is read from the account.

{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: dialogs that set inert on the page behind them (seen with React 19)",
  "article": "a-camera-that-walks-up-to-a-shoe-springs-buying-inside-a-3d-room-and-a-wall",
  "articleRevision": 1,
  "assumed": "focusing the link in the close handler would work, as it does without `inert`.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "open a shoe, open the bag, press Esc twice: `document.activeElement` is the shoe's link on the wall.",
  "evidence": "commit 0951249.",
  "fix": "remember where focus should go, and move it once the commit has lifted `inert`.",
  "format": 2,
  "happened": "closing focused the shoe's link straight away, while its list was still `inert`, so focus stayed where it was, on the bag button. No error anywhere.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-CTFN",
  "packages": "",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 1,
  "publishedAt": "2026-11-05T22:01:52.493Z",
  "rule": "If closing a dialog must return focus to an element under an `inert` parent, remember the target and focus it in an effect after the state that lifts `inert` has committed.",
  "site": "https://upfork.dev",
  "snippet": "```tsx\nimport { useEffect, useRef, useState, type RefObject } from \"react\";\nexport function useReturnFocus(links: RefObject<(HTMLAnchorElement | null)[]>) {\n  const [open, setOpen] = useState(-1);\n  const returnTo = useRef(-1);\n  // before: close() called links.current[open]?.focus() at once, while <ul inert> was still in the DOM\n  const close = () => {\n    returnTo.current = open;\n    setOpen(-1);\n  };\n  useEffect(() => {\n    if (open < 0 && returnTo.current >= 0) {\n      links.current?.[returnTo.current]?.focus({ preventScroll: true });\n      returnTo.current = -1;\n    }\n  }, [open, links]);\n  return { open, setOpen, close }; // render the wall as <ul inert={open >= 0 || undefined}>\n}\n```",
  "title": "Focus sent into a list that is still inert goes nowhere: move it after the state that lifts inert commits",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-CTFN",
  "version": 1,
  "why": ""
}