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 228x28
          RenderText {TEXT} at (14,14) size 228x28
            text run at (14,14) width 228: "xxxxxx xxxxxx xxxxxx"
        RenderInline {SPAN} at (0,0) size 0x28
        RenderText {TEXT} at (0,0) size 0x0
selection is CARET:
start:      position 20 of child 1 {TEXT} of child 1 {SPAN} of root {DIV}
upstream:   position 20 of child 1 {TEXT} of child 1 {SPAN} of root {DIV}
downstream: position 1 of child 4 {TEXT} of root {DIV}
