{
 "compat_features": [
  "api.MutationEvent",
  "api.MutationEvent.attrChange",
  "api.MutationEvent.attrName",
  "api.MutationEvent.initMutationEvent",
  "api.MutationEvent.newValue",
  "api.MutationEvent.prevValue",
  "api.MutationEvent.relatedNode"
 ],
 "description": "Mutation events like DOMSubtreeModified, DOMNodeInserted, or DOMNodeRemoved fire when DOM changes occur.",
 "description_html": "Mutation events like <code>DOMSubtreeModified</code>, <code>DOMNodeInserted</code>, or <code>DOMNodeRemoved</code> fire when DOM changes occur.",
 "discouraged": {
  "according_to": [
   "https://www.w3.org/TR/2024/WD-uievents-20240906/#legacy-mutationevent-events",
   "https://github.com/web-platform-tests/interop/issues/784"
  ],
  "alternatives": [
   "mutationobserver"
  ],
  "reason": "Mutation events negatively impact performance and they were selected for removal from the web as part of Interop 2025.",
  "reason_html": "Mutation events negatively impact performance and they were selected for removal from the web as part of Interop 2025.",
  "removal_date": "2025-09-15"
 },
 "group": [
  "dom"
 ],
 "kind": "feature",
 "name": "Mutation events",
 "spec": [
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 ],
 "status": {
  "baseline": false,
  "by_compat_key": {
   "api.MutationEvent": {
    "baseline": false,
    "support": {}
   },
   "api.MutationEvent.attrChange": {
    "baseline": false,
    "support": {}
   },
   "api.MutationEvent.attrName": {
    "baseline": false,
    "support": {}
   },
   "api.MutationEvent.initMutationEvent": {
    "baseline": false,
    "support": {}
   },
   "api.MutationEvent.newValue": {
    "baseline": false,
    "support": {}
   },
   "api.MutationEvent.prevValue": {
    "baseline": false,
    "support": {}
   },
   "api.MutationEvent.relatedNode": {
    "baseline": false,
    "support": {}
   }
  },
  "support": {}
 },
 "id": "mutation-events",
 "groups": [
  "dom"
 ],
 "specs": [
  {
   "url": "https://w3c.github.io/uievents/",
   "seriesComposition": "full",
   "shortname": "uievents",
   "series": {
    "shortname": "uievents",
    "currentSpecification": "uievents",
    "title": "UI Events",
    "shortTitle": "UI Events",
    "releaseUrl": "https://www.w3.org/TR/uievents/",
    "nightlyUrl": "https://w3c.github.io/uievents/"
   },
   "organization": "W3C",
   "groups": [
    {
     "name": "Web Applications Working Group",
     "url": "https://www.w3.org/groups/wg/webapps/"
    }
   ],
   "release": {
    "url": "https://www.w3.org/TR/uievents/",
    "status": "Working Draft",
    "filename": "Overview.html"
   },
   "nightly": {
    "url": "https://w3c.github.io/uievents/",
    "status": "Editor's Draft",
    "alternateUrls": [],
    "repository": "https://github.com/w3c/uievents",
    "sourcePath": "index.bs",
    "filename": "index.html"
   },
   "title": "UI Events",
   "source": "w3c",
   "shortTitle": "UI Events",
   "categories": [
    "browser"
   ],
   "standing": "good",
   "tests": {
    "repository": "https://github.com/web-platform-tests/wpt",
    "testPaths": [
     "uievents"
    ]
   },
   "fragment": null
  }
 ],
 "mdnUrls": [
  {
   "slug": "Web/API/MutationEvent",
   "title": "MutationEvent",
   "anchor": null,
   "url": "https://developer.mozilla.org/docs/Web/API/MutationEvent"
  }
 ],
 "standardPositions": [],
 "hasNegativeStandardPosition": false,
 "stateOfSurveys": [],
 "chromeUseCounters": {},
 "interop": [
  {
   "year": 2025,
   "label": "interop-2025-remove-mutation-events",
   "url": "https://wpt.fyi/interop-2025?feature=interop-2025-remove-mutation-events"
  }
 ],
 "wpt": null,
 "developerSignals": null,
 "bugs": {
  "chrome": [
   "https://crbug.com/40268638"
  ]
 },
 "useCases": null,
 "baselineLowDateAsObject": null,
 "baselineHighDateAsObject": null
}