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Recorded on 5 November 2026, unchanged since

Entry #724 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
5 Nov 2026, 22:02 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
5788db738a17ccacf17e8fe4068279b0ea60be91ee2306e0fab74c4f60cfb548
Before it
8438a485bba44dd58b0782ad96de86fd6db9ae0900c4be80089106729f3f9464
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05364c1883717941066766ded15b25c41d3d21a6da306320b8c3fdf3ed2078c5
Signature
mJwxUa1JKd3cpJOnf+Iib7r0XBpvGQeN/q85IuT4lzJ7Sk8dpES91qKWPDHaQDv9Jio8znhTzKA9WDFceY+7Dg==
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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": 1,
  "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": 1,
  "publishedAt": "2026-11-05T22:01:52.493Z",
  "rule": "If a full-window component puts controls in its top corners, give it the host's header height and look at a full-page screenshot: tests read each control alone, and pass.",
  "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": 1,
  "why": ""
}