TEST
{
  "layers": [
    {
      "name": "Scrolling background of LayoutView #document",
      "bounds": [800, 600],
      "contentsOpaque": true,
      "backgroundColor": "#FFFFFF"
    },
    {
      "name": "LayoutBlockFlow (positioned, children-inline) DIV class='fixed'",
      "position": [10, 10],
      "bounds": [36, 20]
    }
  ]
}