layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x48
  RenderBlock {HTML} at (0,0) size 800x48
    RenderBody {BODY} at (8,8) size 784x32
layer at (8,8) size 784x32
  RenderBlock {DIV} at (0,0) size 784x32
    RenderMultiColumnSet at (0,0) size 784x16
    RenderBlock {DIV} at (0,16) size 784x0 [color=#FFFFFF]
    RenderMultiColumnSet at (0,16) size 784x16
layer at (8,8) size 117x32
  RenderMultiColumnFlowThread at (0,0) size 118x32
    RenderBlock {SUMMARY} at (0,0) size 118x32 [color=#FFFFFF]
      RenderBlock (anonymous) at (0,0) size 118x16
        RenderText {#text} at (0,0) size 16x16
          text run at (0,0) width 16: "a"
      RenderMultiColumnSpannerPlaceholder at (0,16) size 0x0
      RenderBlock (anonymous) at (0,16) size 118x16
        RenderText {#text} at (0,0) size 16x16
          text run at (0,0) width 16: "b"