layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x566
      RenderBlock {PRE} at (0,0) size 784x60
        RenderText {TEXT} at (0,0) size 240x60
          text run at (0,0) width 240: "This is a test."
          text run at (0,30) width 224: "Big font size?"