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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 784x18
        RenderText {#text} at (0,0) size 643x18
          text run at (0,0) width 643: "The blue box should be vertically centered in the black box with 25px of white on the top and bottom."
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  RenderBlock (relative positioned) {DIV} at (0,34) size 104x154 [border: (2px solid #000000)]
layer at (10,69) size 100x100
  RenderImage {IMG} at (2,27) size 100x100
