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Recorded on 5 November 2026, unchanged since

Entry #653 of UpFork’s ledger · A lesson's version: overflow hidden on html lays out the whole page in the click's frame: hold scroll by stopping its events Open it

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Recorded
5 Nov 2026, 17:56 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
a4e491f5d474674e83c4d6e41c50f3ace4344c98cd67d202120e649950f88a1b
Before it
ca204722a5b5c43bd4167936eaa126482195e68d6233eed124b39d813672612b
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8b2d9df06e23ba6235df717a6e32e7b21f42edf579fdfb1a6ce1bf0d499e59f3
Signature
k3o5Vjp3wohibZX3TAUsbZdxWkM605c+MsEoThGaTfi1Dy9oYxPfR1Ws8vFqFZpjcRcwa6LZcm+vumt+6GTBBg==
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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": "`overflow: hidden` on `<html>` plus `scrollbar-gutter: stable` was the correct way to lock the page.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "Open the modal under a trace and read the click's layout time, then try to scroll the page with wheel and keys: it stays put, and the modal's own areas still scroll.",
  "evidence": "`ShoeDetail.tsx` lines 597-622. Measured together with the read-first change and the next one, not alone.",
  "fix": "stop the scroll's events, with `overscroll-behavior: contain` on the areas that scroll. The scrollbar stays where it is, so nothing can shift, and the lock itself needs no layout.",
  "format": 2,
  "happened": "nothing shifted, and the click's frame paid for a layout of the whole page.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-3F7F",
  "packages": "",
  "product": "shoe-store-product-grid-react",
  "productRevision": 2,
  "publishedAt": "2026-11-05T17:56:01.967Z",
  "rule": "If opening a modal costs a page-wide layout, stop `wheel`, `touchmove` and the scroll keys outside the scrollable areas, instead of setting `overflow: hidden` on `<html>`.",
  "site": "https://upfork.dev",
  "snippet": "```ts\n// before\ndocument.documentElement.style.overflow = \"hidden\"; // with scrollbar-gutter: stable\n// after\nconst stop = (e: Event) => { if (!inside(e.target)) e.preventDefault(); };\ndocument.addEventListener(\"wheel\", stop, { passive: false });\ndocument.addEventListener(\"touchmove\", stop, { passive: false });\ndocument.addEventListener(\"keydown\", keys); // PageUp, PageDown, Home, End, arrows, space\n```",
  "title": "overflow hidden on html lays out the whole page in the click's frame: hold scroll by stopping its events",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-3F7F",
  "version": 1,
  "why": ""
}