layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x416
  RenderBlock {HTML} at (0,0) size 800x416
    RenderBody {BODY} at (8,8) size 784x400
      RenderBlock (anonymous) at (0,0) size 784x0
        RenderInline {SPAN} at (0,0) size 0x0 [color=#008000]
      RenderBlock (anonymous) at (0,0) size 784x200
        RenderBlock (generated) at (0,0) size 784x200 [color=#0000FF]
          RenderText at (0,0) size 200x200
            text run at (0,0) width 200: "A"
        RenderBlock {DIV} at (0,200) size 784x0 [color=#008000]
      RenderBlock (anonymous) at (0,200) size 784x200
        RenderInline {SPAN} at (0,0) size 200x200 [color=#008000]
          RenderText {#text} at (0,0) size 200x200
            text run at (0,0) width 200: "B"
        RenderText {#text} at (0,0) size 0x0
        RenderText {#text} at (0,0) size 0x0