{
  "layers": [
    {
      "name": "LayoutView #document",
      "bounds": [800, 600],
      "contentsOpaque": true,
      "drawsContent": true,
      "paintInvalidations": [
        {
          "object": "VerticalScrollbar",
          "rect": [185, 0, 15, 100],
          "reason": "scroll control"
        },
        {
          "object": "InlineTextBox 'a'",
          "rect": [0, 5, 15, 15],
          "reason": "disappeared"
        },
        {
          "object": "InlineTextBox 'z'",
          "rect": [0, 5, 15, 15],
          "reason": "appeared"
        }
      ]
    }
  ],
  "objectPaintInvalidations": [
    {
      "object": "VerticalScrollbar",
      "reason": "scroll control"
    },
    {
      "object": "LayoutBlockFlow DIV id='dynamic' class='content'",
      "reason": "full"
    },
    {
      "object": "RootInlineBox",
      "reason": "full"
    },
    {
      "object": "LayoutText #text",
      "reason": "appeared"
    },
    {
      "object": "InlineTextBox 'z'",
      "reason": "appeared"
    }
  ]
}