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Recorded on 26 October 2026, unchanged since

Entry #135 of UpFork’s ledger · A lesson's version: A requestAnimationFrame timestamp can be earlier than the performance.now() you took before it: clamp progress at zero Open it

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Recorded: 26 Oct 2026, 10:22 UTC
Signed with: k1 · Ed25519
Entry hash: 1e6c0dea02b30e2230466841a1f83364a584c5f6cbe361962e2bd9a8e56a4d8d
Before it: 6e9fabe937b0ad538a2f6445cb0a11beb1bbad2728b7fde7eb9d2d0e5e9faff6
Record hash: a82af24b5bbd08d03725c5590137bb4cfb8ed8c1880b5198adc99a009f8d3e8a
Signature: jXRBIgD0EEZcJCU34SFPDav3ZwWVcmfKIkp6diz8aEekUwhAQdp1JHdZBBv1dPkJfflGUxywIFNnOrL3Pr5SBQ==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "a-webgl-hero-in-a-web-worker-lightfall-s-lane-space-shader-offscreencanvas-a",
  "articleRevision": 1,
  "assumed": "with `t0 = performance.now()` taken just before the first `requestAnimationFrame`, the progress `(now - t0) / 1200` would start at zero.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "StatCounter.tsx lines 38–39; the phone capture was recorded again on the fixed build.",
  "fix": "clamp progress to 0..1 before easing.",
  "happened": "the timestamp a frame callback gets is when that frame began, which can be a little before `t0`. Progress came out slightly negative, and the ease `1 - 2^(-10t)` turned that into a negative number: a phone capture caught a stat flashing below zero.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-HQ1T",
  "packages": "",
  "product": "crypto-web3-hero-section-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T10:21:58.532Z",
  "site": "https://upfork.dev",
  "title": "A requestAnimationFrame timestamp can be earlier than the performance.now() you took before it: clamp progress at zero",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-HQ1T",
  "version": 1,
  "why": ""
}