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layer at (0,0) size 800x600
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    RenderBody {BODY} at (8,8) size 784x584
      RenderBlock {P} at (0,0) size 784x19
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          text run at (0,0) width 636: "The blue box should be horizontally centered in the black box with 25px of white on the left and right."
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  RenderBlock (relative positioned) {DIV} at (0,33) size 154x104 [border: (2px solid #000000)]
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  RenderImage {IMG} at (27,2) size 100x100
