{
  "title": "vastlint.org VAST benchmark, production sample aggregates",
  "published": "2026-10-03",
  "note": "Aggregate counts only. No XML, hosts, networks, or per-document rows are published. Self-selected sample of tags pasted into or fetched by vastlint.org tools; not a census.",
  "window": {
    "first": "2026-07-06",
    "last": "2026-09-22",
    "cutoffUtc": "2026-09-22T23:59:59.999Z",
    "recheckedWithVastlint": "2026-09-29",
    "wrapperUrlsFetched": false
  },
  "documents": 694,
  "countries": 49,
  "documentsFromUnitedStates": 250,
  "excluded": {
    "mcpDocuments": 882,
    "reason": "documents sent to the hosted MCP endpoint are reported separately"
  },
  "bySource": {
    "tester": 451,
    "validator": 161,
    "iabFormatTester": 57,
    "inspector": 23,
    "other": 2
  },
  "defects": {
    "definition": "errors only; a document can sit in more than one class",
    "unreadable": 81,
    "missingImpression": 32,
    "unusableVideo": 28,
    "emptyWrapperOrEmptyVast": 14,
    "anyOfTheFour": 149,
    "anyOfTheFourShare": 0.215
  },
  "topErrorRulesByDocuments": [
    {
      "id": "VAST-2.0-parse-error",
      "documents": 58
    },
    {
      "id": "VAST-4.1-tracking-event-value",
      "documents": 36
    },
    {
      "id": "VAST-4.0-universaladid-present",
      "documents": 29
    },
    {
      "id": "VAST-2.0-url-empty",
      "documents": 28
    },
    {
      "id": "VAST-2.0-inline-impression",
      "documents": 24
    },
    {
      "id": "VAST-2.0-mediafile-dimensions",
      "documents": 24
    },
    {
      "id": "VAST-2.0-root-element",
      "documents": 23
    },
    {
      "id": "VAST-2.0-root-version",
      "documents": 16
    },
    {
      "id": "VAST-2.0-mediafile-delivery",
      "documents": 13
    },
    {
      "id": "VAST-2.0-root-has-ad-or-error",
      "documents": 13
    },
    {
      "id": "VAST-2.0-linear-duration",
      "documents": 11
    },
    {
      "id": "VAST-2.0-mediafile-type",
      "documents": 11
    }
  ]
}