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Entry #134 of UpFork’s ledger · A lesson's version: A data attribute set from a media query after hydration shifted the layout: keep server markup stable, use CSS Open it

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Recorded: 26 Oct 2026, 10:22 UTC
Signed with: k1 · Ed25519
Entry hash: 6e9fabe937b0ad538a2f6445cb0a11beb1bbad2728b7fde7eb9d2d0e5e9faff6
Before it: 0e5f368f49d659b58d475b1ef592f9fd570f6ffe1fd7b10df4740b07a233d42c
Record hash: 7db2dcb00370f3ee267d351ce9dd2cca5a13a73af11a615e8832bb87d2645d5b
Signature: FXwXe9zkswWcIxZPsPGFi2IeeAXANqIjnT4JdPD5tjR2nWycGkNC15sTIHW+9JVnAuF1Oz8MnAlNbzf3uxnvAg==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "a-webgl-hero-in-a-web-worker-lightfall-s-lane-space-shader-offscreencanvas-a",
  "articleRevision": 1,
  "assumed": "centring the hero on narrow screens by setting `data-align=\"center\"` from a `useMediaQuery` hook was harmless.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "LightfallHero.tsx lines 148–153, 273–275 and 310; styles.css lines 1115–1121; CLS 0 on desktop and mobile.",
  "fix": "`data-align` always carries the prop, and a `@media (max-width: 1023px)` rule centres the copy; the media query is now used only for what the canvas draws (where the light is centred), which moves no layout. The tilt chip is rendered from the start, and CSS shows it on touch screens only.",
  "happened": "the server can't know the screen's width, so it rendered the hero's own alignment, and on a phone the attribute flipped to \"center\" after hydration, moving the copy. A chip shown only on touch screens also appeared after mount. Lighthouse mobile measured a layout shift of 0.026.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-5XZP",
  "packages": "",
  "product": "crypto-web3-hero-section-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T10:21:58.532Z",
  "site": "https://upfork.dev",
  "title": "A data attribute set from a media query after hydration shifted the layout: keep server markup stable, use CSS",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-5XZP",
  "version": 1,
  "why": ""
}