{
  "layers": [
    {
      "name": "LayoutView #document",
      "bounds": [800, 600],
      "contentsOpaque": true,
      "backgroundColor": "#FFFFFF",
      "paintInvalidations": [
        {
          "object": "LayoutBlockFlow DIV",
          "rect": [15, 60, 100, 100],
          "reason": "appeared"
        },
        {
          "object": "LayoutBlockFlow DIV",
          "rect": [15, 60, 100, 100],
          "reason": "disappeared"
        }
      ]
    }
  ],
  "objectPaintInvalidations": [
    {
      "object": "LayoutBlockFlow DIV",
      "reason": "background"
    },
    {
      "object": "LayoutBlockFlow DIV id='target'",
      "reason": "appeared"
    }
  ]
}