{
  "layers": [
    {
      "name": "Scrolling Contents Layer",
      "bounds": [800, 600],
      "contentsOpaque": true,
      "backgroundColor": "#FFFFFF"
    },
    {
      "name": "LayoutIFrame IFRAME id='parent-iframe'",
      "position": [-30, -30],
      "bounds": [390, 240],
      "transform": 1
    },
    {
      "name": "Scrolling Contents Layer",
      "bounds": [285, 230],
      "contentsOpaqueForText": true,
      "backgroundColor": "#C0C0C0",
      "transform": 2
    },
    {
      "name": "LayoutBlockFlow DIV id='test' class='composited box'",
      "bounds": [210, 210],
      "contentsOpaque": true,
      "backgroundColor": "#0000FF",
      "transform": 3
    },
    {
      "name": "ContentsLayer for Vertical Scrollbar Layer",
      "position": [285, 0],
      "bounds": [15, 150],
      "transform": 2
    },
    {
      "name": "LayoutBlockFlow (positioned) DIV class='overlay'",
      "position": [5, 5],
      "bounds": [50, 50],
      "backgroundColor": "#00000033"
    }
  ],
  "transforms": [
    {
      "id": 1,
      "transform": [
        [1, 0, 0, 0],
        [0, 1, 0, 0],
        [0, 0, 1, 0],
        [28, 28, 0, 1]
      ]
    },
    {
      "id": 2,
      "parent": 1,
      "transform": [
        [1, 0, 0, 0],
        [0, 1, 0, 0],
        [0, 0, 1, 0],
        [15, 15, 0, 1]
      ]
    },
    {
      "id": 3,
      "parent": 2,
      "transform": [
        [1, 0, 0, 0],
        [0, 1, 0, 0],
        [0, 0, 1, 0],
        [18, 10, 0, 1]
      ]
    }
  ]
}