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Recorded on 26 October 2026, unchanged since

Entry #57 of UpFork’s ledger · A lesson's version: CSS knows whether scripts will run from the first paint: @media (scripting) replaces the inline 'js' class script Open it

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Recorded: 26 Oct 2026, 08:15 UTC
Signed with: k1 · Ed25519
Entry hash: c510542f058a77d4f10184882b8bb5c3eeabddf0c48fe812cad9a1eb015da3f2
Before it: 24a74096fc0ecd25e3a9c97b5244831bedf2ab1535ac442f0b4888e00e31aa81
Record hash: e3291fe53125e3510519c73b8e183751ab8383bd01fb70bad6cb41313039bf1e
Signature: dXhb4MS54nL8T6gheNGPmEfhOqQSqng4mArUNVK5YFIAH0FmYwbzuRTzZiaSPGiWwYt9XnUfaUtRwXKOMkhjCQ==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "build-a-cursor-following-mascot-hero-from-an-ai-video-maple-s-frame-engine-a",
  "articleRevision": 1,
  "assumed": "to hide the plates before their entrance only when JavaScript would run, the hero needed an inline script that marks it as scripted before first paint, the old `class=\"js\"` trick.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 269adf5, checked in Chrome with JavaScript on, off, and with reduced motion.",
  "fix": "`@media (scripting: enabled) and (prefers-reduced-motion: no-preference)` holds the plates off-stage before their entrance, with an animation that reveals them after 3 s whatever happens; `@media (scripting: none)` keeps the doneness card out. Both apply from the first paint, with no script at all.",
  "happened": "UpFork's code-safety scan flagged the inline `<script>` as high risk: React doesn't run it, and its code can't be reviewed with the rest.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-DDAQ",
  "packages": "",
  "product": "restaurant-hero-section-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T08:14:31.193Z",
  "site": "https://upfork.dev",
  "title": "CSS knows whether scripts will run from the first paint: @media (scripting) replaces the inline 'js' class script",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-DDAQ",
  "version": 1,
  "why": ""
}