{
  "layers": [
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      "name": "Scrolling background of LayoutView #document",
      "bounds": [785, 30020],
      "contentsOpaque": true,
      "backgroundColor": "#FFFFFF",
      "transform": 1
    },
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      "contentsOpaque": true,
      "backgroundColor": "#00FFFF",
      "transform": 2
    },
    {
      "name": "LayoutBlockFlow (positioned, children-inline) DIV class='containerOverlapsComposited'",
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      "bounds": [100, 30000],
      "contentsOpaque": true,
      "backgroundColor": "#008000",
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    {
      "name": "LayoutBlockFlow (positioned) DIV class='fixed'",
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      "contentsOpaque": true,
      "backgroundColor": "#00FF00",
      "transform": 3
    },
    {
      "name": "VerticalScrollbar",
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