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Recorded on 5 November 2026, unchanged since

Entry #650 of UpFork’s ledger · A lesson's version: A 2 px layout shift reads as CLS 0: compare element positions directly to prove a reserved line holds Open it

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Recorded
5 Nov 2026, 17:56 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
e07cf306c22778404e23f58e831fa2b139bb5e471aa635375df43be888d879dc
Before it
bfaab24234c6cb52227adaca70c877ec0ba725a55ec447268b87aeb9498be900
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7ad1d1a44d8b018f9a35b7f769ce8a1778759fb8bfd9217148b34afec2bf3785
Signature
jElrPV/hZ2JTiNTPfREUGqgpfMmOOtCixeQIIHrQNXWuvsu8C1fZAHDedDoiGsD+4q0le5pt2N+XIOQt51HJAg==
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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: Chrome 156",
  "article": "how-to-make-a-product-fly-from-a-grid-to-its-detail-view-in-react-with-no-an",
  "articleRevision": 1,
  "assumed": "a layout-shift score of 0 through the whole add-to-bag flow proved nothing moved.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "Read the positions of the button, the line and the links before and after each state: unchanged.",
  "evidence": "`styles.css` lines 1365-1376; positions unchanged through every state, layout shift 0.",
  "fix": "give the inline button no padding, set the line's height from its own line height, and compare positions in the test.",
  "format": 2,
  "happened": "the line under the button had a `min-height` of 26 px. An inline button with its own padding made it 28 px when \"View bag\" appeared, and moved the link below it. The score still read 0.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-FEXZ",
  "packages": "",
  "product": "shoe-store-product-grid-react",
  "productRevision": 2,
  "publishedAt": "2026-11-05T17:56:01.967Z",
  "rule": "If you must prove a state change moved nothing, compare `getBoundingClientRect()` before and after. A CLS of 0 does not show it: a small shift of a small element rounds away.",
  "site": "https://upfork.dev",
  "snippet": "```css\n/* before: an inline button's own padding made the line 28 px */\n.pw-confirm { min-height: 26px; }\n/* after */\n.pw-confirm { min-height: 28px; padding-top: 6px; line-height: 20px; }\n.pw-confirm .pw-text-button { padding: 0; line-height: inherit; }\n```",
  "title": "A 2 px layout shift reads as CLS 0: compare element positions directly to prove a reserved line holds",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-FEXZ",
  "version": 1,
  "why": ""
}