{
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  "api.CloseWatcher.close",
  "api.CloseWatcher.close_event",
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 ],
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 ],
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     "chrome_android": "126",
     "edge": "126",
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     "firefox_android": "149"
    }
   },
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     "firefox_android": "149"
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   },
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     "chrome_android": "126",
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     "firefox_android": "149"
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   },
   "api.CloseWatcher.destroy": {
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     "chrome_android": "126",
     "edge": "126",
     "firefox": "149",
     "firefox_android": "149"
    }
   },
   "api.CloseWatcher.requestClose": {
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    "support": {
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     "chrome_android": "126",
     "edge": "126",
     "firefox": "149",
     "firefox_android": "149"
    }
   }
  },
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   "chrome_android": "126",
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   "firefox": "149",
   "firefox_android": "149"
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 },
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   "url": "https://html.spec.whatwg.org/multipage/interaction.html#close-requests-and-close-watchers",
   "seriesComposition": "full",
   "shortname": "html",
   "series": {
    "shortname": "html",
    "currentSpecification": "html",
    "title": "HTML",
    "shortTitle": "HTML",
    "nightlyUrl": "https://html.spec.whatwg.org/multipage/"
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   "nightly": {
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    "status": "Living Standard",
    "sourcePath": "source",
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     "https://html.spec.whatwg.org/multipage/dom.html",
     "https://html.spec.whatwg.org/multipage/semantics.html",
     "https://html.spec.whatwg.org/multipage/sections.html",
     "https://html.spec.whatwg.org/multipage/grouping-content.html",
     "https://html.spec.whatwg.org/multipage/text-level-semantics.html",
     "https://html.spec.whatwg.org/multipage/links.html",
     "https://html.spec.whatwg.org/multipage/edits.html",
     "https://html.spec.whatwg.org/multipage/embedded-content.html",
     "https://html.spec.whatwg.org/multipage/images.html",
     "https://html.spec.whatwg.org/multipage/iframe-embed-object.html",
     "https://html.spec.whatwg.org/multipage/media.html",
     "https://html.spec.whatwg.org/multipage/image-maps.html",
     "https://html.spec.whatwg.org/multipage/embedded-content-other.html",
     "https://html.spec.whatwg.org/multipage/tables.html",
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     "https://html.spec.whatwg.org/multipage/form-control-infrastructure.html",
     "https://html.spec.whatwg.org/multipage/interactive-elements.html",
     "https://html.spec.whatwg.org/multipage/scripting.html",
     "https://html.spec.whatwg.org/multipage/canvas.html",
     "https://html.spec.whatwg.org/multipage/custom-elements.html",
     "https://html.spec.whatwg.org/multipage/semantics-other.html",
     "https://html.spec.whatwg.org/multipage/microdata.html",
     "https://html.spec.whatwg.org/multipage/interaction.html",
     "https://html.spec.whatwg.org/multipage/dnd.html",
     "https://html.spec.whatwg.org/multipage/popover.html",
     "https://html.spec.whatwg.org/multipage/browsers.html",
     "https://html.spec.whatwg.org/multipage/nav-history-apis.html",
     "https://html.spec.whatwg.org/multipage/document-sequences.html",
     "https://html.spec.whatwg.org/multipage/browsing-the-web.html",
     "https://html.spec.whatwg.org/multipage/document-lifecycle.html",
     "https://html.spec.whatwg.org/multipage/speculative-loading.html",
     "https://html.spec.whatwg.org/multipage/webappapis.html",
     "https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html",
     "https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html",
     "https://html.spec.whatwg.org/multipage/system-state.html",
     "https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html",
     "https://html.spec.whatwg.org/multipage/comms.html",
     "https://html.spec.whatwg.org/multipage/server-sent-events.html",
     "https://html.spec.whatwg.org/multipage/web-messaging.html",
     "https://html.spec.whatwg.org/multipage/workers.html",
     "https://html.spec.whatwg.org/multipage/worklets.html",
     "https://html.spec.whatwg.org/multipage/webstorage.html",
     "https://html.spec.whatwg.org/multipage/syntax.html",
     "https://html.spec.whatwg.org/multipage/parsing.html",
     "https://html.spec.whatwg.org/multipage/named-characters.html",
     "https://html.spec.whatwg.org/multipage/xhtml.html",
     "https://html.spec.whatwg.org/multipage/rendering.html",
     "https://html.spec.whatwg.org/multipage/obsolete.html",
     "https://html.spec.whatwg.org/multipage/iana.html",
     "https://html.spec.whatwg.org/multipage/indices.html",
     "https://html.spec.whatwg.org/multipage/references.html",
     "https://html.spec.whatwg.org/multipage/acknowledgements.html"
    ],
    "filename": "index.html"
   },
   "organization": "WHATWG",
   "groups": [
    {
     "name": "HTML Workstream",
     "url": "https://html.spec.whatwg.org/multipage/"
    }
   ],
   "title": "HTML",
   "source": "whatwg",
   "shortTitle": "HTML",
   "categories": [
    "browser"
   ],
   "standing": "good",
   "tests": {
    "repository": "https://github.com/web-platform-tests/wpt",
    "testPaths": [
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     "custom-elements",
     "eventsource",
     "html",
     "imagebitmap-renderingcontext",
     "import-maps",
     "navigation-api",
     "webmessaging",
     "webstorage",
     "workers",
     "worklets",
     "x-frame-options"
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    "excludePaths": [
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     "html/dom/partial-updates/tentative",
     "html/cross-origin-embedder-policy/credentialless"
    ]
   },
   "fragment": "close-requests-and-close-watchers"
  }
 ],
 "mdnUrls": [
  {
   "slug": "Web/API/CloseWatcher",
   "title": "CloseWatcher",
   "anchor": null,
   "url": "https://developer.mozilla.org/docs/Web/API/CloseWatcher"
  }
 ],
 "standardPositions": [
  {
   "vendor": "apple",
   "url": "https://github.com/WebKit/standards-positions/issues/215",
   "position": "neutral",
   "concerns": []
  }
 ],
 "hasNegativeStandardPosition": false,
 "stateOfSurveys": [],
 "chromeUseCounters": {
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  "url": "https://chromestatus.com/metrics/webfeature/timeline/popularity/259"
 },
 "interop": [],
 "wpt": {
  "url": "https://wpt.fyi/results?q=feature:closewatcher"
 },
 "developerSignals": {
  "url": "https://github.com/web-platform-dx/developer-signals/issues/249",
  "votes": 6
 },
 "bugs": {
  "firefox": [
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  ]
 },
 "baselineLowDateAsObject": null,
 "baselineHighDateAsObject": null,
 "blockedOn": "Safari",
 "monthsBlocked": 1,
 "blockedSince": "March 2026"
}