{
  "about": "An entry of UpFork's ledger. Check it by hand as https://upfork.dev/docs/ledger says, or at https://upfork.dev/verify/E-681",
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    "record": "{\"ai\":{\"apps\":[\"Claude\"],\"models\":[\"Claude Opus 5.5\"]},\"appliesTo\":\"other: Chrome 156\",\"article\":\"how-to-make-a-product-fly-from-a-grid-to-its-detail-view-in-react-with-no-an\",\"articleRevision\":2,\"assumed\":\"every picture could at least zoom by a small fixed amount, so the first version kept a floor of 1.3×.\",\"author\":{\"account\":\"a_9d470b566acab5f65bdc\"},\"check\":\"Read image pixels per screen dot at full zoom on a plain and an emulated 2× screen: never below 1 on a plain screen, or 0.75 per dot on 2×, which is 1.5 per CSS pixel.\",\"evidence\":\"at 1440×900, views at 1.25 image pixels per dot on a plain screen and 0.75 on a 2× screen; zoom at 1.0–1.19 on the plain one. Seven shoes on the plain screen and three on 2×, which was emulated, not a real screen.\",\"fix\":\"one image pixel per dot on a plain screen and 1.5 per CSS pixel on a dense one, with no floor. Below 1.15× zoom is not offered, and the cursor does not promise it. A shoe from a small source gets no cropped views either.\",\"format\":2,\"happened\":\"on a shoe with a 960 px picture that floor went past its own pixels.\",\"kind\":\"my-mistake\",\"learnedBy\":\"ai\",\"lesson\":\"L-ZPR6\",\"packages\":\"\",\"product\":\"shoe-store-product-grid-react\",\"productRevision\":2,\"publishedAt\":\"2026-11-05T19:07:28.782Z\",\"rule\":\"If a zoomed product picture looks soft, cap the zoom at `naturalWidth / (shownWidth × min(devicePixelRatio, 1.5))`, drop any floor, and do not offer zoom below about 1.15×.\",\"site\":\"https://upfork.dev\",\"snippet\":\"```ts\\n// before: a floor of 1.3× whatever the source\\nconst shown = box.offsetWidth * (window.devicePixelRatio || 1);\\nconst sharp = shown ? natural / shown : wanted;\\nreturn Math.min(wanted, Math.max(1.3, sharp));\\n// after\\nconst density = Math.min(window.devicePixelRatio || 1, 1.5);\\nreturn Math.min(wanted, natural / (box.offsetWidth * density));\\n```\",\"title\":\"A fixed minimum zoom makes small pictures soft: limit zoom by naturalWidth and devicePixelRatio, with no floor\",\"type\":\"lesson-version\",\"url\":\"https://upfork.dev/lessons/L-ZPR6\",\"version\":2,\"why\":\"\"}",
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}