layer at (0,0) size 800x600
  LayoutView at (0,0) size 800x600
layer at (0,0) size 800x600
  LayoutDeprecatedFlexibleBox {HTML} at (0,0) size 800x600
    LayoutDeprecatedFlexibleBox {BODY} at (0,0) size 800x600 [color=#FFFFFF] [bgcolor=#008000]
      LayoutBlockFlow (anonymous) at (0,0) size 453.70x600
        LayoutText {#text} at (0,0) size 454x17
          text run at (0,0) width 454: "You should see white text on a green background that fills the window."