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Entry #838 of UpFork’s ledger · A lesson's version: React Native Web sets nothing for accessibilityViewIsModal: give a modal sheet role dialog and aria-modal on the web Open it

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Recorded
14 Nov 2026, 09:05 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
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k1 · Ed25519
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vLXVIeFY2bDDfQO6622y1w0mRfO1AYFGQcwVy8S/OEXwI6vgR74/51BmySuwzZDKvvpKityfZTzR26lv4LnrCg==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "react-native-web@>=0.21 <0.22",
  "article": "swing-tags-and-a-flight-off-the-hook-in-react-native-outline-hit-tests-share",
  "articleRevision": 1,
  "assumed": "React Native's accessibility props reach the web as they reach VoiceOver and TalkBack.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "open the sheet in the web build and query the DOM: the sheet's element has role=\"dialog\" and aria-modal=\"true\".",
  "evidence": "the accessibility check reads `aria-modal=\"true\"` on the open detail (commit 8861494).",
  "fix": "`role=\"dialog\"` with `aria-modal` on a modal sheet (not beside a side panel, where the rail stays live and the panel is not modal).",
  "format": 2,
  "happened": "the open detail sheet, with `accessibilityViewIsModal`, had no `aria-modal` and no dialog role in the DOM, so a screen reader on the web could wander out of it into the rail behind.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-Q5D6",
  "packages": "react-native-web@0.21.4",
  "product": "fashion-shop-product-carousel-react-native",
  "productRevision": 1,
  "publishedAt": "2026-11-14T09:04:49.247Z",
  "rule": "If a modal sheet built with accessibilityViewIsModal has no dialog role or aria-modal in the web DOM, pass role=\"dialog\" and aria-modal as well; keep the native prop for phones.",
  "site": "https://upfork.dev",
  "snippet": "```tsx\n// before: the modal sheet as on a phone\n<View accessibilityViewIsModal={live}>{sheet}</View>\n// after: the web learns it is a modal dialog only from these\n<View accessibilityViewIsModal={live} role={live ? 'dialog' : undefined} aria-modal={live ? true : undefined}>{sheet}</View>\n```",
  "title": "React Native Web sets nothing for accessibilityViewIsModal: give a modal sheet role dialog and aria-modal on the web",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-Q5D6",
  "version": 1,
  "why": ""
}