{
  "date": "2026-10-05",
  "runtime": "v24.19.0",
  "app_sha256": "b5b23e8c7028a1ee6ede9b41b459f5213af44661fc42f3d8c07b4a45f99c0644",
  "method": "Synthetic fixtures, not Claude samples. Actual homepage script in minimal DOM. Invisible checkbox on; dash Keep unless matrix says otherwise. Observations are fixture-specific, not general application tests.",
  "rows": [
    {
      "label": "NUL separator",
      "stage": "direct string",
      "mode": "keep",
      "input": "A\u0000B",
      "output": "A\u0000B",
      "input_codepoints": "U+0041 U+0000 U+0042",
      "output_codepoints": "U+0041 U+0000 U+0042",
      "status": "No selected invisible characters found",
      "before": {
        "controls": [
          "U+0000"
        ],
        "utf16": 3
      },
      "after": {
        "controls": [
          "U+0000"
        ],
        "utf16": 3
      }
    },
    {
      "label": "Backspace",
      "stage": "direct string",
      "mode": "keep",
      "input": "A\bB",
      "output": "A\bB",
      "input_codepoints": "U+0041 U+0008 U+0042",
      "output_codepoints": "U+0041 U+0008 U+0042",
      "status": "No selected invisible characters found",
      "before": {
        "controls": [
          "U+0008"
        ],
        "utf16": 3
      },
      "after": {
        "controls": [
          "U+0008"
        ],
        "utf16": 3
      }
    },
    {
      "label": "Escape prefix",
      "stage": "direct string",
      "mode": "keep",
      "input": "\u001b[31mred\u001b[0m",
      "output": "\u001b[31mred\u001b[0m",
      "input_codepoints": "U+001B U+005B U+0033 U+0031 U+006D U+0072 U+0065 U+0064 U+001B U+005B U+0030 U+006D",
      "output_codepoints": "U+001B U+005B U+0033 U+0031 U+006D U+0072 U+0065 U+0064 U+001B U+005B U+0030 U+006D",
      "status": "No selected invisible characters found",
      "before": {
        "controls": [
          "U+001B",
          "U+001B"
        ],
        "utf16": 12
      },
      "after": {
        "controls": [
          "U+001B",
          "U+001B"
        ],
        "utf16": 12
      }
    },
    {
      "label": "Control plus selected marker",
      "stage": "direct string",
      "mode": "keep",
      "input": "A\u0000​B",
      "output": "A\u0000B",
      "input_codepoints": "U+0041 U+0000 U+200B U+0042",
      "output_codepoints": "U+0041 U+0000 U+0042",
      "status": "Removed 1 invisible character",
      "before": {
        "controls": [
          "U+0000"
        ],
        "utf16": 4
      },
      "after": {
        "controls": [
          "U+0000"
        ],
        "utf16": 3
      }
    }
  ]
}