{
  "layers": [
    {
      "name": "Scrolling Contents Layer",
      "bounds": [800, 600],
      "contentsOpaque": true,
      "backgroundColor": "#FFFFFF"
    },
    {
      "name": "LayoutBlockFlow (positioned) DIV id='container' class='composited box'",
      "bounds": [300, 300],
      "drawsContent": false
    },
    {
      "name": "LayoutHTMLCanvas (positioned) CANVAS",
      "bounds": [200, 200],
      "invalidations": [
        [0, 0, 200, 200]
      ]
    },
    {
      "name": "ContentsLayer for LayoutHTMLCanvas (positioned) CANVAS",
      "bounds": [200, 200]
    }
  ]
}