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layer at (0,0) size 800x600
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          text run at (0,0) width 779: "This test ensures selection that crosses the shadow DOM boundary of a readonly input element cannot be made by a mouse drag."
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          text run at (0,0) width 759: "To manually test, select text by a mouse drag starting in \"hello\" and ending in \"world\". Selection should not extend into the input"
          text run at (0,20) width 50: "element."
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            text run at (0,6) width 28: "hello"
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          text run at (28,6) width 4: " "
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layer at (42,105) size 59x20
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    RenderText {#text} at (0,0) size 37x20
      text run at (0,0) width 37: "world"
selection start: position 2 of child 0 {#text} of child 1 {SPAN} of child 5 {DIV} of body
selection end:   position 1 of child 2 {#text} of child 5 {DIV} of body