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layer at (0,0) size 800x200
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    RenderBody {BODY} at (8,16) size 784x172
      RenderBlock {P} at (0,0) size 784x20
        RenderText {#text} at (0,0) size 399x19
          text run at (0,0) width 399: "This tests horizontal caret movement in vertical writing mode."
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        RenderBlock {P} at (20,0) size 24x136
          RenderText {#text} at (1,27) size 21x109
            text run at (1,27) width 109 RTL: "\x{5D0}\x{5E0}\x{5D9} \x{5D7}\x{5EA}\x{5D5}\x{5DC}."
        RenderBlock {P} at (64,0) size 24x136
          RenderText {#text} at (1,15) size 21x121
            text run at (1,15) width 121 RTL: "\x{5D0}\x{5D9}\x{5DF} \x{5DC}\x{5D9} \x{5E9}\x{5DD}."
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selection start: position 5 of child 0 {#text} of child 1 {P} of child 3 {DIV} of body
selection end:   position 5 of child 0 {#text} of child 2 {P} of child 3 {DIV} of body