{
  "layers": [
    {
      "name": "LayoutView #document",
      "bounds": [800, 600],
      "contentsOpaque": true,
      "drawsContent": true
    },
    {
      "name": "LayoutBlockFlow DIV id='container'",
      "position": [8, 8],
      "bounds": [400, 400],
      "shouldFlattenTransform": false,
      "drawsContent": true,
      "backgroundColor": "#0000FF"
    },
    {
      "name": "Scrolling Layer",
      "bounds": [400, 400],
      "shouldFlattenTransform": false
    },
    {
      "name": "Scrolling Contents Layer",
      "bounds": [400, 2000],
      "contentsOpaque": true,
      "drawsContent": true,
      "paintInvalidations": [
        {
          "object": "LayoutBlockFlow DIV id='container'",
          "rect": [0, 500, 400, 1500],
          "reason": "background on scrolling contents layer"
        }
      ]
    },
    {
      "name": "Overflow Controls Host Layer",
      "bounds": [400, 400]
    },
    {
      "name": "Horizontal Scrollbar Layer",
      "position": [0, 400],
      "bounds": [400, 0],
      "drawsContent": true
    },
    {
      "name": "Vertical Scrollbar Layer",
      "position": [400, 0],
      "bounds": [0, 400],
      "drawsContent": true
    }
  ],
  "objectPaintInvalidations": [
    {
      "object": "Scrolling Contents Layer",
      "reason": "background on scrolling contents layer"
    }
  ]
}