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 155x28
          RenderText {TEXT} at (14,14) size 112x28
            text run at (14,14) width 112: "here isxxxx"
          RenderText {TEXT} at (126,14) size 43x28
            text run at (126,14) width 43: " text"
        RenderText {TEXT} at (0,0) size 0x0
selection is CARET:
start:      position 11 of child 1 {TEXT} of child 2 {SPAN} of root {DIV}
upstream:   position 11 of child 1 {TEXT} of child 2 {SPAN} of root {DIV}
downstream: position 0 of child 2 {TEXT} of child 2 {SPAN} of root {DIV}
