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Recorded on 5 November 2026, unchanged since

Entry #721 of UpFork’s ledger · A lesson's version: A pill outline in a stretched viewBox went pointed at 1020 px wide: drop the viewBox Open it

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Recorded
5 Nov 2026, 22:02 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
24d34ffc3bc9a8ff9f6435fcc7608f3807a9e350e033bd521a2ec737bc862e87
Before it
f32c501cae83c50c7748cc289a2b06f9d59c0d49c16de7f7919ded1cec170efd
Record hash
cfa0d0db1347fdcecc69d2b5a985b8c7dec073cf203d9676a98c702bdfff7d18
Signature
wc53UmCuiAnY1aecxBjuMeUwfwPWtHV3KlEVInjXlZb5Vn983rgveSqSUfio/AufHAYWrLHbM6S7JsbpfFlJCw==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: SVG shapes stretched with preserveAspectRatio none",
  "article": "a-camera-that-walks-up-to-a-shoe-springs-buying-inside-a-3d-room-and-a-wall",
  "articleRevision": 1,
  "assumed": "`vector-effect: non-scaling-stroke` would keep the outline true at any width.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "screenshot the pill at its narrowest and its widest (411 px and 1020 px here): both ends are half-circles of the same radius.",
  "evidence": "commit badceaf.",
  "fix": "no viewBox, percentage sizes, and the svg inset by half the stroke.",
  "format": 2,
  "happened": "it keeps the stroke's width, not the shape: the radius was in viewBox units, so it stretched with the box. Fine at 411 px, pointed at 1020 px on a 3440 px window. Lesson L-941T on this site explains why a pill's border should be an SVG stroke at all; this is the trap that comes next.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-CSYK",
  "packages": "",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 1,
  "publishedAt": "2026-11-05T22:01:52.493Z",
  "rule": "If an SVG outline uses `preserveAspectRatio=\"none\"` with radii in viewBox units, its round ends distort as it stretches: drop the viewBox and give the rect percentage sizes.",
  "site": "https://upfork.dev",
  "snippet": "```tsx\n// before (P3)\n<svg className=\"fl-pill-line\" aria-hidden=\"true\" preserveAspectRatio=\"none\" viewBox=\"0 0 300 56\">\n  <rect x=\"0.75\" y=\"0.75\" width=\"298.5\" height=\"54.5\" rx=\"27.25\" ry=\"27.25\" vectorEffect=\"non-scaling-stroke\" />\n</svg>\n// after: no viewBox, so rx and ry are real pixels at any width\n<svg className=\"fl-pill-line\" aria-hidden=\"true\">\n  <rect width=\"100%\" height=\"100%\" rx=\"27.25\" ry=\"27.25\" />\n</svg>\n```\n```css\n/* pulled in by half the stroke, so the whole line stays inside the 56 px pill */\n.fl-pill-line {\n  position: absolute;\n  inset: 0.75px;\n  width: calc(100% - 1.5px);\n  height: calc(100% - 1.5px);\n  overflow: visible;\n  fill: none;\n  stroke: var(--fl-line);\n  stroke-width: 1.5;\n}\n```",
  "title": "A pill outline in a stretched viewBox went pointed at 1020 px wide: drop the viewBox",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-CSYK",
  "version": 1,
  "why": ""
}