{
  "checked_on": "2026-09-29",
  "method": "Local Chrome; same 1672x941 JPEG; rendered width 320 CSS px; response delayed by 20 seconds. Element rectangles measured before and after image complete. This is not CLS measurement or production user data.",
  "rows": [
    {
      "mode": "none",
      "before_height": 0,
      "after_height": 180.09375,
      "marker_delta": 180.09375
    },
    {
      "mode": "css_aspect_ratio_16_9",
      "before_height": 180,
      "after_height": 180,
      "marker_delta": 0
    },
    {
      "mode": "html_width_1672_height_941",
      "before_height": 180.09375,
      "after_height": 180.09375,
      "marker_delta": 0
    }
  ]
}