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 784x584
      RenderBlock {DIV} at (0,0) size 784x56 [border: (2px solid #FF0000)]
        RenderInline {SPAN} at (0,0) size 87x28
          RenderText {TEXT} at (14,14) size 37x28
            text run at (14,14) width 37: "bar "
          RenderInline {SPAN} at (0,0) size 18x28
            RenderText {TEXT} at (51,14) size 18x28
              text run at (51,14) width 18: "   "
          RenderText {TEXT} at (69,14) size 32x28
            text run at (69,14) width 32: "foo"
        RenderText {TEXT} at (0,0) size 0x0
selection is CARET:
start:      position 4 of child 1 {TEXT} of child 2 {SPAN} of root {DIV}
upstream:   position 4 of child 1 {TEXT} of child 2 {SPAN} of root {DIV}
downstream: position 0 of child 1 {TEXT} of child 2 {SPAN} of child 2 {SPAN} of root {DIV}
