{
  "testDate": "2026-10-27",
  "scope": "Controlled local experiment on synthetic media. No external video service was tested.",
  "environment": {
    "os": "Windows",
    "mode": "Headless installed desktop browsers",
    "transport": "Local HTTP, no network throttling",
    "cache": "Fresh isolated context per condition; server Cache-Control: no-store"
  },
  "fixture": {
    "filename": "sample.webm",
    "width": 640,
    "height": 360,
    "recordingTargetSeconds": 6,
    "videoCodec": "VP8",
    "audioCodec": "Opus",
    "audioTrack": "Silent track present",
    "bytes": 355284,
    "sha256": "5dceb57ab16bea8a090fb55c751115bd1d5cf2a37118d3beb8252c8887c5ba13"
  },
  "method": {
    "runsPerConditionPerBrowser": 3,
    "preloadObservationMs": 2000,
    "playbackObservationMs": 700,
    "bytesDefinition": "Sum of completed HTTP media response bodies, excluding HTTP headers, HTML, and page assets; not the cellular bill or viewing time.",
    "autoplay": "play() called from the page script without a gesture; manual conditions use a Playwright button click. Default browser policy; no autoplay policy override."
  },
  "preload": [
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 1,
      "preload": "none",
      "currentTime": 0,
      "paused": true,
      "readyState": 0,
      "mediaError": null,
      "requests": [],
      "mediaBodyBytes": 0
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 1,
      "preload": "metadata",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 1,
      "preload": "auto",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 2,
      "preload": "none",
      "currentTime": 0,
      "paused": true,
      "readyState": 0,
      "mediaError": null,
      "requests": [],
      "mediaBodyBytes": 0
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 2,
      "preload": "metadata",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 2,
      "preload": "auto",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 3,
      "preload": "none",
      "currentTime": 0,
      "paused": true,
      "readyState": 0,
      "mediaError": null,
      "requests": [],
      "mediaBodyBytes": 0
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 3,
      "preload": "metadata",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 3,
      "preload": "auto",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 1,
      "preload": "none",
      "currentTime": 0,
      "paused": true,
      "readyState": 0,
      "mediaError": null,
      "requests": [],
      "mediaBodyBytes": 0
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 1,
      "preload": "metadata",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 1,
      "preload": "auto",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 2,
      "preload": "none",
      "currentTime": 0,
      "paused": true,
      "readyState": 0,
      "mediaError": null,
      "requests": [],
      "mediaBodyBytes": 0
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 2,
      "preload": "metadata",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 2,
      "preload": "auto",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 3,
      "preload": "none",
      "currentTime": 0,
      "paused": true,
      "readyState": 0,
      "mediaError": null,
      "requests": [],
      "mediaBodyBytes": 0
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 3,
      "preload": "metadata",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 3,
      "preload": "auto",
      "currentTime": 0,
      "paused": true,
      "readyState": 4,
      "mediaError": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ],
      "mediaBodyBytes": 355284
    }
  ],
  "playback": [
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 1,
      "action": "audible",
      "scenario": "valid",
      "playResult": {
        "resolved": false,
        "error": "NotAllowedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 1,
      "action": "muted",
      "scenario": "valid",
      "playResult": {
        "resolved": true,
        "error": null
      },
      "currentTime": 0.700334,
      "paused": false,
      "muted": true,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 1,
      "action": "manual",
      "scenario": "valid",
      "playResult": {
        "resolved": true,
        "error": null
      },
      "currentTime": 0.678947,
      "paused": false,
      "muted": false,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 1,
      "action": "manual",
      "scenario": "html",
      "playResult": {
        "resolved": false,
        "error": "NotSupportedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": 4,
      "mediaMessage": "PipelineStatus::DEMUXER_ERROR_COULD_NOT_OPEN: FFmpegDemuxer: open context failed",
      "requests": [
        {
          "status": 200,
          "contentType": "text/html",
          "range": "bytes=0-",
          "contentRange": null,
          "bodyBytes": 76,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 1,
      "action": "manual",
      "scenario": "forbidden",
      "playResult": {
        "resolved": false,
        "error": "NotSupportedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": 4,
      "mediaMessage": "MEDIA_ELEMENT_ERROR: Format error",
      "requests": [
        {
          "status": 403,
          "contentType": "text/plain",
          "range": "bytes=0-",
          "contentRange": null,
          "bodyBytes": 43,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 2,
      "action": "audible",
      "scenario": "valid",
      "playResult": {
        "resolved": false,
        "error": "NotAllowedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
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      "scenario": "valid",
      "playResult": {
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        "error": null
      },
      "currentTime": 0.69434,
      "paused": false,
      "muted": true,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 2,
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      "scenario": "valid",
      "playResult": {
        "resolved": true,
        "error": null
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      "currentTime": 0.675883,
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      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 2,
      "action": "manual",
      "scenario": "html",
      "playResult": {
        "resolved": false,
        "error": "NotSupportedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": 4,
      "mediaMessage": "PipelineStatus::DEMUXER_ERROR_COULD_NOT_OPEN: FFmpegDemuxer: open context failed",
      "requests": [
        {
          "status": 200,
          "contentType": "text/html",
          "range": "bytes=0-",
          "contentRange": null,
          "bodyBytes": 76,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 2,
      "action": "manual",
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      "playResult": {
        "resolved": false,
        "error": "NotSupportedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": 4,
      "mediaMessage": "MEDIA_ELEMENT_ERROR: Format error",
      "requests": [
        {
          "status": 403,
          "contentType": "text/plain",
          "range": "bytes=0-",
          "contentRange": null,
          "bodyBytes": 43,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 3,
      "action": "audible",
      "scenario": "valid",
      "playResult": {
        "resolved": false,
        "error": "NotAllowedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 3,
      "action": "muted",
      "scenario": "valid",
      "playResult": {
        "resolved": true,
        "error": null
      },
      "currentTime": 0.682025,
      "paused": false,
      "muted": true,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 3,
      "action": "manual",
      "scenario": "valid",
      "playResult": {
        "resolved": true,
        "error": null
      },
      "currentTime": 0.664651,
      "paused": false,
      "muted": false,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 3,
      "action": "manual",
      "scenario": "html",
      "playResult": {
        "resolved": false,
        "error": "NotSupportedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": 4,
      "mediaMessage": "PipelineStatus::DEMUXER_ERROR_COULD_NOT_OPEN: FFmpegDemuxer: open context failed",
      "requests": [
        {
          "status": 200,
          "contentType": "text/html",
          "range": "bytes=0-",
          "contentRange": null,
          "bodyBytes": 76,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "msedge",
      "version": "156.0.4314.42",
      "run": 3,
      "action": "manual",
      "scenario": "forbidden",
      "playResult": {
        "resolved": false,
        "error": "NotSupportedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": 4,
      "mediaMessage": "MEDIA_ELEMENT_ERROR: Format error",
      "requests": [
        {
          "status": 403,
          "contentType": "text/plain",
          "range": "bytes=0-",
          "contentRange": null,
          "bodyBytes": 43,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 1,
      "action": "audible",
      "scenario": "valid",
      "playResult": {
        "resolved": false,
        "error": "NotAllowedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 1,
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      "playResult": {
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        "error": null
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      "currentTime": 0.680551,
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      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
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          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
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      "action": "manual",
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      "playResult": {
        "resolved": true,
        "error": null
      },
      "currentTime": 0.690421,
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      "requests": [
        {
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          "contentType": "video/webm",
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          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 1,
      "action": "manual",
      "scenario": "html",
      "playResult": {
        "resolved": false,
        "error": "NotSupportedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": 4,
      "mediaMessage": "PipelineStatus::DEMUXER_ERROR_COULD_NOT_OPEN: FFmpegDemuxer: open context failed",
      "requests": [
        {
          "status": 200,
          "contentType": "text/html",
          "range": "bytes=0-",
          "contentRange": null,
          "bodyBytes": 76,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 1,
      "action": "manual",
      "scenario": "forbidden",
      "playResult": {
        "resolved": false,
        "error": "NotSupportedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": 4,
      "mediaMessage": "MEDIA_ELEMENT_ERROR: Format error",
      "requests": [
        {
          "status": 403,
          "contentType": "text/plain",
          "range": "bytes=0-",
          "contentRange": null,
          "bodyBytes": 43,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 2,
      "action": "audible",
      "scenario": "valid",
      "playResult": {
        "resolved": false,
        "error": "NotAllowedError"
      },
      "currentTime": 0,
      "paused": true,
      "muted": false,
      "mediaError": null,
      "mediaMessage": null,
      "requests": [
        {
          "status": 206,
          "contentType": "video/webm",
          "range": "bytes=0-",
          "contentRange": "bytes 0-355283/355284",
          "bodyBytes": 355284,
          "responseFinished": true
        }
      ]
    },
    {
      "browser": "chrome",
      "version": "155.0.8059.85",
      "run": 2,
      "action": "muted",
      "scenario": "valid",
      "playResult": {
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        "error": null
      },
      "currentTime": 0.67852,
      "paused": false,
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      "mediaError": null,
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