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layer at (0,0) size 800x372
  RenderBlock {HTML} at (0,0) size 800x372
    RenderBody {BODY} at (8,16) size 784x348
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          text run at (0,0) width 387: "This test passes if <mspace> does not create child renderers."
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        RenderMathMLMath {math} at (0,14) size 100x300
          RenderMathMLSpace {mspace} at (0,0) size 100x300
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