{
  "bounds": [800, 600],
  "children": [
    {
      "bounds": [800, 600],
      "contentsOpaque": true,
      "drawsContent": true,
      "repaintRects": [
        [550, 50, 100, 500]
      ],
      "paintInvalidationClients": [
        "LayoutHTMLCanvas (positioned) CANVAS id='canvas'"
      ]
    }
  ]
}