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 600x56
        RenderText {TEXT} at (0,0) size 139x28
          text run at (0,0) width 139: "There is a tide"
        RenderBR {BR} at (0,0) size 0x0
        RenderText {TEXT} at (0,28) size 241x28
          text run at (0,28) width 241: "Which taken at the flood"
selection is CARET:
start:      position 0 of child 3 {TEXT} of child 1 {DIV} of root {BODY}
upstream:   position 1 of child 2 {BR} of child 1 {DIV} of root {BODY}
downstream: position 0 of child 3 {TEXT} of child 1 {DIV} of root {BODY}