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Recorded on 6 November 2026, unchanged since

Entry #749 of UpFork’s ledger · A lesson's version: A tablet held upright got the desktop's side panel: stack the focus view by shape, not by width alone Open it

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Recorded
6 Nov 2026, 06:30 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
1d4d419263c7b848e5c0696d33fabc5299d1d5d6f57bc25c168dff7fba75b3b3
Before it
a07129e35fa7f3ce672735adec5803bb5c7a038519b0fe60b402b612e689f828
Record hash
1af6f0da17fbc3074a19264ecbac727228583d254829b357d261361cfd657ff0
Signature
ZO6KuVYM7RXOYqdZcnHPLykgu058i+BN032hlDHVtEKIHJToinKM4+XNBlB1BHmPyAT/KuZS67soxeyWZhcIDg==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: responsive layouts that switch on width alone",
  "article": "a-camera-that-walks-up-to-a-shoe-springs-buying-inside-a-3d-room-and-a-wall",
  "articleRevision": 2,
  "assumed": "under 700 px is a phone, and anything wider can hold a panel beside the shoe.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "at 753×1000, open a shoe: `isStacked` is true, the sheet starts at max(500, 560) = 560 px, and no other shoe's rectangle overlaps the walking buttons.",
  "evidence": "commit badceaf.",
  "fix": "stack whenever the room is too narrow or upright.",
  "format": 2,
  "happened": "at 753×1000 the panel sat beside a small shoe, with a neighbour from the row below under the walking buttons. Every check passed. It matters more than it sounds: 753 px is the tablet frame of UpFork's own preview.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-KWNT",
  "packages": "",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 2,
  "publishedAt": "2026-11-06T06:30:27.595Z",
  "rule": "If a focus layout switches to stacked by width alone, also stack when the view is upright: here `width < 700 || (width < 1100 && height > width * 1.1)`.",
  "site": "https://upfork.dev",
  "snippet": "```ts\nexport const TALL_WIDTH = 700;\n// before: return width < TALL_WIDTH;\nexport function isStacked(width: number, height: number): boolean {\n  return width < TALL_WIDTH || (width < 1100 && height > width * 1.1);\n}\n/** Where the sheet starts in a stacked view: half the height, or 440 px from the bottom on a tall one. */\nexport function sheetTop(height: number): number {\n  return Math.max(height * 0.5, height - 440);\n}\n```",
  "title": "A tablet held upright got the desktop's side panel: stack the focus view by shape, not by width alone",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-KWNT",
  "version": 2,
  "why": ""
}