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layer at (0,0) size 800x600
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    RenderBody {BODY} at (8,8) size 784x584
      RenderBlock {P} at (0,0) size 784x32
        RenderText {#text} at (0,0) size 744x32
          text run at (0,0) width 744: "This test ensures selection that crosses the shadow DOM boundary of a readonly input element cannot be made by a"
          text run at (0,16) width 79: "mouse drag."
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        RenderText {#text} at (0,0) size 746x32
          text run at (0,0) width 746: "To manually test, select text by a mouse drag starting in \"hello\" and ending in \"world\". Selection should only extend"
          text run at (0,16) width 158: "inside the input element."
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        RenderTextControl {INPUT} at (0,0) size 59.39x24 [bgcolor=#FFFFFF] [border: (2px inset #EEEEEE)]
        RenderText {#text} at (59,6) size 5x16
          text run at (59,6) width 5: " "
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          RenderText {#text} at (63,6) size 38x16
            text run at (63,6) width 38: "world"
        RenderText {#text} at (0,0) size 0x0
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    RenderText {#text} at (0,0) size 38x18
      text run at (0,0) width 38: "hello"
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selection end:   position 5 of child 0 {#text} of child 0 {DIV} of {#document-fragment} of child 1 {INPUT} of child 5 {DIV} of body