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Recorded on 6 November 2026, unchanged since

Entry #744 of UpFork’s ledger · A lesson's version: The store's header sat on the focus view's corners: pass the host's header height and look at the whole page Open it

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Recorded
6 Nov 2026, 06:30 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
4a6d01c16b002c8cfcf81ce42b832c7057fa1e498e2e60f0207c4f6a2914c3a1
Before it
e4efb4a5b3bb3a3cae88271d9eaa99cfbb4a744223c5d971cd75e6cb481fd6c4
Record hash
9746147eda36ce0b6c2b5c4a0c9e9f0e2577cbd4822d6e8629608eb2c0b71520
Signature
Jv9TuDJOcM5AgvAcudn+IiPXX3oG4ZwqP8wNZpeay42lSzXp8+e/8KJl0SbN7BFfwFQ9EMYejsZDpu/WZGVCCA==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: components that fill the window under a host's header",
  "article": "a-camera-that-walks-up-to-a-shoe-springs-buying-inside-a-3d-room-and-a-wall",
  "articleRevision": 2,
  "assumed": "the demo's header and the component's controls would not meet.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "screenshot the whole page in focus with the bag open: the store's logo does not touch \"Back to the wall\", and its Bag button does not touch the drawer's close button.",
  "evidence": "commit 0951249.",
  "fix": "pass it, and look at a screenshot of the whole page, not only at what tests can read.",
  "format": 2,
  "happened": "the store's logo sat right on \"Back to the wall\", and its Bag button on the drawer's close button. `detailTop` existed for this, and the demo did not pass it. All 31 buying checks passed with it in plain view.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-14XP",
  "packages": "",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 2,
  "publishedAt": "2026-11-06T06:30:27.595Z",
  "rule": "If a full-window component draws controls in its top corners under a host's header, pass the header's height (`detailTop` here), and check a full-page screenshot, not only each control alone.",
  "site": "https://upfork.dev",
  "snippet": "```tsx\n// before: the demo store had a 72 px header and did not say so\n// <Floodlit shoes={shoes} />\n<Floodlit shoes={shoes} detailTop={72} />\n```\n```css\n/* Inside, everything at the top starts below the host's header. */\n.fl-stage-top {\n  position: absolute;\n  top: calc(var(--fl-detail-top, 0px) + clamp(12px, 3vh, 28px));\n}\n```",
  "title": "The store's header sat on the focus view's corners: pass the host's header height and look at the whole page",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-14XP",
  "version": 2,
  "why": ""
}