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layer at (0,0) size 800x600
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          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 775x35
          text run at (0,0) width 775: "To manually test, select text by a mouse drag starting in \"hello\" and ending in \"world\". Selection should not extend into the"
          text run at (0,18) width 89: "input element."
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            text run at (0,5) width 31: "hello"
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          text run at (31,5) width 4: " "
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      text run at (0,0) width 39: "world"
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selection end:   position 1 of child 2 {#text} of child 5 {DIV} of body