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Recorded on 6 November 2026, unchanged since

Entry #747 of UpFork’s ledger · A lesson's version: On a phone the sheet came up empty 0.7 s before its words: let a container enter with what is on it Open it

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Recorded
6 Nov 2026, 06:30 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
dba0a233532f0989fb1e079c0b98a371c444565653a6957f796d45a1dd29447c
Before it
d599c9a8cd18c5663c255d6d52fd089bdcf529953fbbd2171e13fe508a5b6906
Record hash
e821146f0fac445d549456185308408cc2569e3576b20adea84d056e82ad7db6
Signature
EDhQ5zAaueEUSI0O22gR1gYqfzgjAY6KpEp55ysXyTQaYJIVTTf3Rmv96yoEdH4iq2cogb71dNfr/zD+Xk99Ag==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: sheets and panels whose contents enter on a cue",
  "article": "a-camera-that-walks-up-to-a-shoe-springs-buying-inside-a-3d-room-and-a-wall",
  "articleRevision": 2,
  "assumed": "contents that enter on a cue make the panel enter on it too.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "take screenshots back to back after a tap at 390×844: no still shows the sheet without its words.",
  "evidence": "commit 6fc7667; `scripts/qa/motion-sweep.mjs`, the open stills.",
  "fix": "the sheet itself waits for the cue and rises with its words.",
  "format": 2,
  "happened": "frames from the middle of the walk showed the sheet's dark block up from the tap, empty, with its words only from about 0.9 s. It was also most of what the frozen screen showed.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-KEX9",
  "packages": "",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 2,
  "publishedAt": "2026-11-06T06:30:27.595Z",
  "rule": "If a panel's contents wait for a cue but its background does not, the background shows as an empty block: hide and lower the container itself until the cue.",
  "site": "https://upfork.dev",
  "snippet": "```css\n/* before: only the words waited (.fl-rise); the sheet's dark background was up from the tap */\n.fl-body[data-stack] .fl-panel {\n  background: var(--fl-sheet);\n  transition: opacity 0.3s ease, transform 0.42s var(--fl-ease);\n}\n/* until the cue, hidden and 28 px low. Walking along (data-along) it stays, and only its words change. */\n.fl-body[data-stack] .fl-focus:not([data-show]):not([data-along]) .fl-panel {\n  opacity: 0;\n  transform: translate3d(0, 28px, 0);\n  transition: opacity 0.16s ease, transform 0.16s ease;\n}\n@media (prefers-reduced-motion: reduce) {\n  .fl-body[data-stack] .fl-panel,\n  .fl-body[data-stack] .fl-focus:not([data-show]):not([data-along]) .fl-panel {\n    transform: none;\n    transition: opacity 0.16s linear;\n  }\n}\n```",
  "title": "On a phone the sheet came up empty 0.7 s before its words: let a container enter with what is on it",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-KEX9",
  "version": 1,
  "why": ""
}