layer at (0,0) size 800x600
  RenderView {#document} at (0,0) size 800x600
layer at (0,0) size 800x19
  RenderBlock {foo} at (0,0) size 800x19
    RenderText {#text} at (0,0) size 99x19
      text run at (0,0) width 99: "Hello World!"