{
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    {
      "name": "Scrolling Contents Layer",
      "bounds": [800, 600],
      "contentsOpaque": true,
      "backgroundColor": "#FFFFFF",
      "invalidations": [
        [50, 50, 75, 75]
      ]
    },
    {
      "name": "LayoutBlockFlow (positioned) DIV id='container'",
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      "backgroundColor": "#0000FF",
      "invalidations": [
        [0, 0, 100, 100],
        [50, 50, 75, 75]
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  ],
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}