{
  "status": "Observed cancellation, not successful transfer",
  "viewport": {
    "width": 320,
    "height": 568
  },
  "source": "研讨项目",
  "target": "OH capsule",
  "observations": [
    {
      "sourceState": "Original third row near the fixed bottom controls",
      "input": "Six immediate CDP move steps across the complete drag path",
      "originalRunPassed": false,
      "naturalCleanup": true,
      "scrollGeometry": null,
      "pointerEvents": [
        {
          "time": 3270.600000023842,
          "type": "pointerdown",
          "pointerId": 4,
          "pointerType": "touch",
          "trusted": true,
          "x": 45,
          "y": 484.5,
          "active": false
        },
        {
          "time": 3975,
          "type": "pointermove",
          "pointerId": 4,
          "pointerType": "touch",
          "trusted": true,
          "x": 64.41666412353516,
          "y": 492.5,
          "active": true
        },
        {
          "time": 3976.600000023842,
          "type": "pointercancel",
          "pointerId": 4,
          "pointerType": "touch",
          "trusted": true,
          "x": 0,
          "y": 0,
          "active": false
        },
        {
          "time": 3976.600000023842,
          "type": "lostpointercapture",
          "pointerId": 4,
          "pointerType": "touch",
          "trusted": true,
          "x": 0,
          "y": 0,
          "active": false
        }
      ],
      "touchMoves": [
        {
          "time": 3976.800000011921,
          "cancelled": false,
          "cancelable": false,
          "active": false
        },
        {
          "time": 4020,
          "cancelled": false,
          "cancelable": false,
          "active": false
        },
        {
          "time": 4054.600000023842,
          "cancelled": false,
          "cancelable": false,
          "active": false
        },
        {
          "time": 4076.2000000476837,
          "cancelled": false,
          "cancelable": false,
          "active": false
        },
        {
          "time": 4121.600000023842,
          "cancelled": false,
          "cancelable": false,
          "active": false
        },
        {
          "time": 4154.200000047684,
          "cancelled": false,
          "cancelable": false,
          "active": false
        }
      ],
      "contextMenus": [],
      "draggingAfterCancel": false,
      "ohRequestCountBeforeOriginalAttempt": 0,
      "ohRequestCountAfter": 0
    },
    {
      "sourceState": "Original third row after a real upward swipe; fully visible above OneShot",
      "input": "Six immediate CDP move steps across the complete drag path",
      "originalRunPassed": false,
      "naturalCleanup": true,
      "scrollGeometry": {
        "label": "320 original source scroll",
        "beforeScroll": {
          "x": 17,
          "y": 442,
          "width": 276,
          "height": 85
        },
        "afterScroll": {
          "x": 17,
          "y": 191,
          "width": 276,
          "height": 85
        },
        "oneShot": {
          "x": 3,
          "y": 444,
          "width": 304,
          "height": 40
        }
      },
      "pointerEvents": [
        {
          "time": 6048,
          "type": "pointerdown",
          "pointerId": 6,
          "pointerType": "touch",
          "trusted": true,
          "x": 45,
          "y": 231.5,
          "active": false
        },
        {
          "time": 6735.699999988079,
          "type": "pointermove",
          "pointerId": 6,
          "pointerType": "touch",
          "trusted": true,
          "x": 64.41666412353516,
          "y": 281.6666564941406,
          "active": true
        },
        {
          "time": 6737.300000011921,
          "type": "pointercancel",
          "pointerId": 6,
          "pointerType": "touch",
          "trusted": true,
          "x": 0,
          "y": 0,
          "active": false
        },
        {
          "time": 6737.300000011921,
          "type": "lostpointercapture",
          "pointerId": 6,
          "pointerType": "touch",
          "trusted": true,
          "x": 0,
          "y": 0,
          "active": false
        }
      ],
      "touchMoves": [
        {
          "time": 6737.399999976158,
          "cancelled": false,
          "cancelable": false,
          "active": false
        },
        {
          "time": 6770.5,
          "cancelled": false,
          "cancelable": false,
          "active": false
        },
        {
          "time": 6838.399999976158,
          "cancelled": false,
          "cancelable": false,
          "active": false
        },
        {
          "time": 6905.300000011921,
          "cancelled": false,
          "cancelable": false,
          "active": false
        }
      ],
      "contextMenus": [],
      "draggingAfterCancel": false,
      "ohRequestCountBeforeOriginalAttempt": 1,
      "ohRequestCountAfter": 1
    }
  ],
  "interpretation": "Chrome emitted a trusted pointercancel and non-cancelable touchmove. It occurred both near the bottom controls and after the same item was fully revealed by real scrolling, so bottom-edge occlusion alone does not explain it. The sparse-input attempts did not deliver to OH; UI drag state cleaned up. Continuous 6px / 16ms touch samples successfully delivered the same scrolled item, retained in the final report. This observation does not establish a universal browser cause or claim a production fix.",
  "productionExperiments": "Capture-phase touchmove and a no-op non-passive touchstart did not repair the sparse-input case and were reverted.",
  "limits": "Desktop Chrome touch emulation; physical Android/iOS behavior not verified."
}