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  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
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    RenderBody {BODY} at (8,8) size 784x584
      RenderBlock {INPUT} at (2,3) size 16x16 [bgcolor=#000000CC] [border: (1px solid #FFFFFF00)]
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        text run at (20,2) width 220: "This checkbox should be checked."