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Recorded on 6 November 2026, unchanged since

Entry #743 of UpFork’s ledger · A lesson's version: Glass shows what is under it: step the page back when the bag opens, and keep a phone's sheet solid Open it

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Recorded
6 Nov 2026, 06:30 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
e4efb4a5b3bb3a3cae88271d9eaa99cfbb4a744223c5d971cd75e6cb481fd6c4
Before it
2b3fa56e55a35718d947013d7debb10bc7cc5fc2f08d7023943cd837ac0f3b9c
Record hash
69924b6b081f4cdf1d0076a15873d2d20fcb9f560551b9ffb712551cfc1d82c6
Signature
7Mkl+NK6olOOZAYluwEFMOc6ArRs012Sv6/acmEKflkuZJlFbL9P7M6RdslW5z08+vqXyvGjho3nTPZeX6zGDA==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: translucent drawers and sheets over live content",
  "article": "a-camera-that-walks-up-to-a-shoe-springs-buying-inside-a-3d-room-and-a-wall",
  "articleRevision": 2,
  "assumed": "glass over the panel would look rich and stay readable.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "open the bag over a shoe in focus: the focus view's computed opacity is 0.32 and the panel's 0. On a phone in focus, sample the sheet's pixels over where the next row's shoe would be: they equal `--fl-sheet`.",
  "evidence": "commits 0951249 and badceaf.",
  "fix": "the bag can be glass because the world dims behind it; the sheet sits on a lit room, so it is solid.",
  "format": 2,
  "happened": "the room behind softened beautifully, and the price and size tiles stayed crisp through the glass, like a ghost page. Later the phone's sheet used the same 94% glass, and a faint shoe from the row below showed through it.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-SH6W",
  "packages": "",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 2,
  "publishedAt": "2026-11-06T06:30:27.595Z",
  "rule": "If a translucent drawer opens over live text, fade that text in the same move; if nothing behind a panel dims, as with a sheet over a lit room, make the panel solid.",
  "site": "https://upfork.dev",
  "snippet": "```css\n/* before: the bag in glass over a panel that stayed as it was, and on phones the sheet in the same glass:\n   .fl-body[data-stack] .fl-panel { background: var(--fl-glass); }   with --fl-glass: rgb(22 21 25 / 0.94) */\n/* after: the page steps back with the room when the bag opens */\n.fl-focus { transition: opacity 0.32s ease; }\n.fl-body[data-bag] .fl-focus { opacity: 0.32; }\n.fl-body[data-bag] .fl-panel { opacity: 0; transition: opacity 0.2s ease; pointer-events: none; }\n/* and a phone's sheet, over a room that stays lit, is solid */\n.fl-body[data-stack] .fl-panel { background: var(--fl-sheet); } /* #18171b at night, #e9e5dd by day */\n```",
  "title": "Glass shows what is under it: step the page back when the bag opens, and keep a phone's sheet solid",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-SH6W",
  "version": 2,
  "why": ""
}