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 #0000FF)]
        RenderText {TEXT} at (14,14) size 652x28
          text run at (14,14) width 652: "Should see \"X\" in top red box, followed by \"X\", in its own red box."
      RenderBlock {DIV} at (0,80) size 784x112
        RenderBlock {DIV} at (0,0) size 784x112 [border: (2px solid #FF0000)]
          RenderBlock (anonymous) at (14,14) size 756x28
            RenderText {TEXT} at (0,0) size 17x28
              text run at (0,0) width 17: "X"
          RenderBlock {DIV} at (14,42) size 756x56 [border: (2px solid #FF0000)]
            RenderText {TEXT} at (14,14) size 17x28
              text run at (14,14) width 17: "X"
selection is CARET:
start:      position 2 of child 1 {TEXT} of child 1 {DIV} of root {DIV}
upstream:   position 2 of child 1 {TEXT} of child 1 {DIV} of root {DIV}
downstream: position 2 of child 1 {TEXT} of child 1 {DIV} of root {DIV}
