layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x43
  RenderBlock {HTML} at (0,0) size 800x43
    RenderBody {BODY} at (8,8) size 784x19
      RenderBlock {P} at (0,0) size 784x19 [border: (1px solid #FF0000) none]
        RenderText {TEXT} at (0,0) size 265x18
          text run at (0,0) width 265: "Nothing should appear below the red line."