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)]
        RenderText {TEXT} at (14,14) size 34x28
          text run at (14,14) width 34: "test"
      RenderBlock {DIV} at (0,56) size 784x56 [border: (2px solid #FF0000)]
        RenderText {TEXT} at (14,14) size 46x28
          text run at (14,14) width 46: "xtest"
selection is CARET:
start:      position 1 of child 1 {TEXT} of child 2 {DIV} of root {BODY}
upstream:   position 1 of child 1 {TEXT} of child 2 {DIV} of root {BODY}
downstream: position 1 of child 1 {TEXT} of child 2 {DIV} of root {BODY}
