{
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  "api.PerformanceResourceTiming.encodedBodySize",
  "api.PerformanceResourceTiming.transferSize"
 ],
 "description": "The decodedBodySize, encodedBodySize, and transferSize properties of the PerformanceResourceTiming API reports the size of resources loaded.",
 "description_html": "The <code>decodedBodySize</code>, <code>encodedBodySize</code>, and <code>transferSize</code> properties of the <code>PerformanceResourceTiming</code> API reports the size of resources loaded.",
 "group": [
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 ],
 "kind": "feature",
 "name": "Resource size",
 "spec": [
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  "https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-encodedbodysize",
  "https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-transfersize"
 ],
 "status": {
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  "baseline_high_date": "2025-09-27",
  "baseline_low_date": "2023-03-27",
  "by_compat_key": {
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    "baseline_high_date": "2025-09-27",
    "baseline_low_date": "2023-03-27",
    "support": {
     "chrome": "54",
     "chrome_android": "54",
     "edge": "17",
     "firefox": "45",
     "firefox_android": "45",
     "safari": "16.4",
     "safari_ios": "16.4"
    }
   },
   "api.PerformanceResourceTiming.encodedBodySize": {
    "baseline": "high",
    "baseline_high_date": "2025-09-27",
    "baseline_low_date": "2023-03-27",
    "support": {
     "chrome": "54",
     "chrome_android": "54",
     "edge": "17",
     "firefox": "45",
     "firefox_android": "45",
     "safari": "16.4",
     "safari_ios": "16.4"
    }
   },
   "api.PerformanceResourceTiming.transferSize": {
    "baseline": "high",
    "baseline_high_date": "2025-09-27",
    "baseline_low_date": "2023-03-27",
    "support": {
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     "chrome_android": "54",
     "edge": "17",
     "firefox": "45",
     "firefox_android": "45",
     "safari": "16.4",
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  },
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   "chrome_android": "54",
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   "safari": "16.4",
   "safari_ios": "16.4"
  }
 },
 "id": "resource-size",
 "groups": [
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 ],
 "specs": [
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   "seriesComposition": "full",
   "shortname": "resource-timing",
   "series": {
    "shortname": "resource-timing",
    "currentSpecification": "resource-timing",
    "title": "Resource Timing",
    "shortTitle": "Resource Timing",
    "releaseUrl": "https://www.w3.org/TR/resource-timing/",
    "nightlyUrl": "https://w3c.github.io/resource-timing/"
   },
   "organization": "W3C",
   "groups": [
    {
     "name": "Web Performance Working Group",
     "url": "https://www.w3.org/groups/wg/webperf/"
    }
   ],
   "release": {
    "url": "https://www.w3.org/TR/resource-timing/",
    "status": "Candidate Recommendation Draft",
    "filename": "Overview.html"
   },
   "nightly": {
    "url": "https://w3c.github.io/resource-timing/",
    "status": "Editor's Draft",
    "alternateUrls": [],
    "repository": "https://github.com/w3c/resource-timing",
    "sourcePath": "index.bs",
    "filename": "index.html"
   },
   "title": "Resource Timing",
   "source": "w3c",
   "shortTitle": "Resource Timing",
   "categories": [
    "browser"
   ],
   "standing": "good",
   "tests": {
    "repository": "https://github.com/web-platform-tests/wpt",
    "testPaths": [
     "resource-timing"
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   },
   "fragment": "dom-performanceresourcetiming-decodedbodysize"
  },
  {
   "url": "https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-encodedbodysize",
   "seriesComposition": "full",
   "shortname": "resource-timing",
   "series": {
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    "currentSpecification": "resource-timing",
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    "nightlyUrl": "https://w3c.github.io/resource-timing/"
   },
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    "status": "Candidate Recommendation Draft",
    "filename": "Overview.html"
   },
   "nightly": {
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    "alternateUrls": [],
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    "sourcePath": "index.bs",
    "filename": "index.html"
   },
   "title": "Resource Timing",
   "source": "w3c",
   "shortTitle": "Resource Timing",
   "categories": [
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   ],
   "standing": "good",
   "tests": {
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    "testPaths": [
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    ]
   },
   "fragment": "dom-performanceresourcetiming-encodedbodysize"
  },
  {
   "url": "https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-transfersize",
   "seriesComposition": "full",
   "shortname": "resource-timing",
   "series": {
    "shortname": "resource-timing",
    "currentSpecification": "resource-timing",
    "title": "Resource Timing",
    "shortTitle": "Resource Timing",
    "releaseUrl": "https://www.w3.org/TR/resource-timing/",
    "nightlyUrl": "https://w3c.github.io/resource-timing/"
   },
   "organization": "W3C",
   "groups": [
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     "name": "Web Performance Working Group",
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   ],
   "release": {
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    "status": "Candidate Recommendation Draft",
    "filename": "Overview.html"
   },
   "nightly": {
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    "alternateUrls": [],
    "repository": "https://github.com/w3c/resource-timing",
    "sourcePath": "index.bs",
    "filename": "index.html"
   },
   "title": "Resource Timing",
   "source": "w3c",
   "shortTitle": "Resource Timing",
   "categories": [
    "browser"
   ],
   "standing": "good",
   "tests": {
    "repository": "https://github.com/web-platform-tests/wpt",
    "testPaths": [
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    ]
   },
   "fragment": "dom-performanceresourcetiming-transfersize"
  }
 ],
 "mdnUrls": [
  {
   "slug": "Web/API/PerformanceResourceTiming/decodedBodySize",
   "title": "PerformanceResourceTiming: decodedBodySize property",
   "anchor": null,
   "url": "https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/decodedBodySize"
  },
  {
   "slug": "Web/API/PerformanceResourceTiming/encodedBodySize",
   "title": "PerformanceResourceTiming: encodedBodySize property",
   "anchor": null,
   "url": "https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/encodedBodySize"
  },
  {
   "slug": "Web/API/PerformanceResourceTiming/transferSize",
   "title": "PerformanceResourceTiming: transferSize property",
   "anchor": null,
   "url": "https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/transferSize"
  }
 ],
 "standardPositions": [],
 "hasNegativeStandardPosition": false,
 "stateOfSurveys": [],
 "chromeUseCounters": {},
 "interop": [],
 "wpt": {
  "url": "https://wpt.fyi/results?q=feature:resource-size"
 },
 "developerSignals": null,
 "bugs": {
  "chrome": [
   "http://crbug.com/611278"
  ]
 },
 "baselineLowDateAsObject": "2023-03-27T00:00:00.000Z",
 "baselineHighDateAsObject": "2025-09-27T00:00:00.000Z"
}