layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x571
      RenderBlock {H1} at (0,0) size 784x38 [bgcolor=#008000]
        RenderText {#text} at (0,1) size 580x36
          text run at (0,1) width 580: "This text should have a green background."