layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x600
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    RenderBody {BODY} at (8,8) size 784x584
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        RenderInline {SPAN} at (0,0) size 390x28
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            text run at (14,95) width 12: "x"
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            text run at (102,95) width 36: "xxx"
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            text run at (214,95) width 36: "xxx"
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selection is CARET:
start:      position 3 of child 8 {TEXT} of child 2 {SPAN} of root {DIV}
upstream:   position 3 of child 8 {TEXT} of child 2 {SPAN} of root {DIV}
downstream: position 3 of child 8 {TEXT} of child 2 {SPAN} of root {DIV}
