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layer at (0,0) size 800x600
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        RenderText {#text} at (0,0) size 776x36
          text run at (0,0) width 776: "This test ensures selection that crosses the shadow DOM boundary of a readonly input element cannot be made by a mouse"
          text run at (0,18) width 32: "drag."
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        RenderText {#text} at (0,0) size 774x36
          text run at (0,0) width 774: "To manually test, select text by a mouse drag starting in \"hello\" and ending in \"world\". Selection should only extend inside"
          text run at (0,18) width 112: "the input element."
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        RenderTextControl {INPUT} at (0,2) size 59x24 [bgcolor=#FFFFFF] [border: (2px inset #000000)]
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          text run at (58,6) width 5: " "
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            text run at (62,6) width 38: "world"
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    RenderText {#text} at (0,0) size 35x18
      text run at (0,0) width 35: "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