{
 "compat_features": [
  "api.HTMLLinkElement.blocking",
  "api.HTMLScriptElement.blocking",
  "api.HTMLStyleElement.blocking",
  "html.elements.link.blocking",
  "html.elements.script.blocking",
  "html.elements.style.blocking"
 ],
 "description": "The blocking=\"render\" attribute for <link>, <script>, and <style> elements blocks rendering until the external script or stylesheet has been loaded. For <link rel=\"expect\">, rendering is blocked until a specific element is in the DOM.",
 "description_html": "The <code>blocking=\"render\"</code> attribute for <code>&#x3C;link></code>, <code>&#x3C;script></code>, and <code>&#x3C;style></code> elements blocks rendering until the external script or stylesheet has been loaded. For <code>&#x3C;link rel=\"expect\"></code>, rendering is blocked until a specific element is in the DOM.",
 "group": [
  "html"
 ],
 "kind": "feature",
 "name": "blocking=\"render\"",
 "spec": [
  "https://html.spec.whatwg.org/multipage/urls-and-fetching.html#blocking-attributes"
 ],
 "status": {
  "baseline": false,
  "by_compat_key": {
   "api.HTMLLinkElement.blocking": {
    "baseline": false,
    "support": {
     "chrome": "105",
     "chrome_android": "105",
     "edge": "105",
     "safari": "18.2",
     "safari_ios": "18.2"
    }
   },
   "api.HTMLScriptElement.blocking": {
    "baseline": false,
    "support": {
     "chrome": "105",
     "chrome_android": "105",
     "edge": "105",
     "safari": "18.2",
     "safari_ios": "18.2"
    }
   },
   "api.HTMLStyleElement.blocking": {
    "baseline": false,
    "support": {
     "chrome": "105",
     "chrome_android": "105",
     "edge": "105",
     "safari": "18.2",
     "safari_ios": "18.2"
    }
   },
   "html.elements.link.blocking": {
    "baseline": false,
    "support": {
     "chrome": "105",
     "chrome_android": "105",
     "edge": "105",
     "safari": "18.2",
     "safari_ios": "18.2"
    }
   },
   "html.elements.script.blocking": {
    "baseline": false,
    "support": {
     "chrome": "105",
     "chrome_android": "105",
     "edge": "105",
     "safari": "18.2",
     "safari_ios": "18.2"
    }
   },
   "html.elements.style.blocking": {
    "baseline": false,
    "support": {
     "chrome": "105",
     "chrome_android": "105",
     "edge": "105",
     "safari": "18.2",
     "safari_ios": "18.2"
    }
   }
  },
  "support": {
   "chrome": "105",
   "chrome_android": "105",
   "edge": "105",
   "safari": "18.2",
   "safari_ios": "18.2"
  }
 },
 "id": "blocking-render",
 "groups": [
  "html"
 ],
 "specs": [
  {
   "url": "https://html.spec.whatwg.org/multipage/urls-and-fetching.html#blocking-attributes",
   "seriesComposition": "full",
   "shortname": "html",
   "series": {
    "shortname": "html",
    "currentSpecification": "html",
    "title": "HTML",
    "shortTitle": "HTML",
    "nightlyUrl": "https://html.spec.whatwg.org/multipage/"
   },
   "nightly": {
    "url": "https://html.spec.whatwg.org/multipage/",
    "status": "Living Standard",
    "sourcePath": "source",
    "alternateUrls": [],
    "repository": "https://github.com/whatwg/html",
    "pages": [
     "https://html.spec.whatwg.org/multipage/introduction.html",
     "https://html.spec.whatwg.org/multipage/infrastructure.html",
     "https://html.spec.whatwg.org/multipage/common-microsyntaxes.html",
     "https://html.spec.whatwg.org/multipage/urls-and-fetching.html",
     "https://html.spec.whatwg.org/multipage/common-dom-interfaces.html",
     "https://html.spec.whatwg.org/multipage/structured-data.html",
     "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",
     "https://html.spec.whatwg.org/multipage/forms.html",
     "https://html.spec.whatwg.org/multipage/input.html",
     "https://html.spec.whatwg.org/multipage/form-elements.html",
     "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": [
     "close-watcher",
     "custom-elements",
     "eventsource",
     "html",
     "imagebitmap-renderingcontext",
     "import-maps",
     "navigation-api",
     "webmessaging",
     "webstorage",
     "workers",
     "worklets",
     "x-frame-options"
    ],
    "excludePaths": [
     "html/cross-origin-embedder-policy/credentialless",
     "html/dom/partial-updates/tentative",
     "html/cross-origin-embedder-policy/credentialless"
    ]
   },
   "fragment": "blocking-attributes"
  }
 ],
 "mdnUrls": [
  {
   "slug": "Web/API/HTMLLinkElement/blocking",
   "title": "HTMLLinkElement: blocking property",
   "anchor": null,
   "url": "https://developer.mozilla.org/docs/Web/API/HTMLLinkElement/blocking"
  },
  {
   "slug": "Web/API/HTMLScriptElement/blocking",
   "title": "HTMLScriptElement: blocking property",
   "anchor": null,
   "url": "https://developer.mozilla.org/docs/Web/API/HTMLScriptElement/blocking"
  },
  {
   "slug": "Web/API/HTMLStyleElement/blocking",
   "title": "HTMLStyleElement: blocking property",
   "anchor": null,
   "url": "https://developer.mozilla.org/docs/Web/API/HTMLStyleElement/blocking"
  }
 ],
 "standardPositions": [
  {
   "vendor": "mozilla",
   "url": "https://github.com/mozilla/standards-positions/issues/608",
   "position": "positive",
   "concerns": []
  },
  {
   "vendor": "apple",
   "url": "https://github.com/WebKit/standards-positions/issues/300",
   "position": "",
   "concerns": []
  }
 ],
 "hasNegativeStandardPosition": false,
 "stateOfSurveys": [
  {
   "name": "State of HTML 2025",
   "url": "https://2025.stateofhtml.com/en-US/performance/#performance_features",
   "question": "performance",
   "subQuestion": "performance_features",
   "path": "dataAPI.surveys.state_of_html.html2025.performance.performance_features.4.entity"
  },
  {
   "name": "State of HTML 2025",
   "url": "https://2025.stateofhtml.com/en-US/features/#all_features",
   "question": "features",
   "subQuestion": "all_features",
   "path": "dataAPI.surveys.state_of_html.html2025.features.all_features.39.entity"
  },
  {
   "name": "State of HTML 2025",
   "url": "https://2025.stateofhtml.com/en-US/_all_features/#all_features",
   "question": "_all_features",
   "subQuestion": "all_features",
   "path": "dataAPI.surveys.state_of_html.html2025._all_features.all_features.39.entity"
  },
  {
   "name": "State of HTML 2024",
   "url": "https://2024.stateofhtml.com/en-US/features/#reading_list",
   "question": "reading_list",
   "subQuestion": "reading_list",
   "path": "dataAPI.surveys.state_of_html.html2024.reading_list.reading_list.combined.allEditions.0.buckets.12.entity"
  },
  {
   "name": "State of HTML 2024",
   "url": "https://2024.stateofhtml.com/en-US/features/#all_features",
   "question": "features",
   "subQuestion": "all_features",
   "path": "dataAPI.surveys.state_of_html.html2024.features.all_features.20.entity"
  },
  {
   "name": "State of HTML 2024",
   "url": "https://2024.stateofhtml.com/en-US/content/#content_features",
   "question": "content",
   "subQuestion": "content_features",
   "path": "dataAPI.surveys.state_of_html.html2024.content.content_features.5.entity"
  },
  {
   "name": "State of HTML 2023",
   "url": "https://2023.stateofhtml.com/en-US/features/#reading_list",
   "question": "reading_list",
   "subQuestion": "reading_list",
   "path": "dataAPI.surveys.state_of_html.html2023.reading_list.reading_list.responses.currentEdition.buckets.12.entity"
  },
  {
   "name": "State of HTML 2023",
   "url": "https://2023.stateofhtml.com/en-US/features/#all_features",
   "question": "features",
   "subQuestion": "all_features",
   "path": "dataAPI.surveys.state_of_html.html2023.features.all_features.17.entity"
  },
  {
   "name": "State of HTML 2023",
   "url": "https://2023.stateofhtml.com/en-US/content/#content_features",
   "question": "content",
   "subQuestion": "content_features",
   "path": "dataAPI.surveys.state_of_html.html2023.content.content_features.5.entity"
  }
 ],
 "chromeUseCounters": {
  "percentageOfPageLoad": 0.10949617,
  "url": "https://chromestatus.com/metrics/webfeature/timeline/popularity/12"
 },
 "interop": [
  {
   "year": 2026,
   "label": "interop-2026-view-transitions",
   "url": "https://wpt.fyi/interop-2026?feature=interop-2026-view-transitions"
  }
 ],
 "wpt": {
  "url": "https://wpt.fyi/results?q=feature:blocking-render"
 },
 "developerSignals": {
  "url": "https://github.com/web-platform-dx/developer-signals/issues/180",
  "votes": 4
 },
 "bugs": {
  "firefox": [
   "https://bugzil.la/1751383"
  ],
  "chrome": [
   "https://bugs.chromium.org/p/chromium/issues/detail?id=1514881",
   "https://bugs.chromium.org/p/chromium/issues/detail?id=1271296"
  ],
  "firefox_android": [
   "https://bugzil.la/1751383"
  ]
 },
 "useCases": null,
 "baselineLowDateAsObject": null,
 "baselineHighDateAsObject": null,
 "blockedOn": "Firefox",
 "blockedSince": "December 2024",
 "monthsBlocked": 21
}