layer at (0,0) size 800x600
  LayoutView at (0,0) size 800x600
layer at (0,0) size 800x256
  LayoutBlockFlow {HTML} at (0,0) size 800x256
    LayoutBlockFlow {BODY} at (8,16) size 784x232
      LayoutBlockFlow {P} at (0,0) size 784x18
        LayoutText {#text} at (0,0) size 459x17
          text run at (0,0) width 459: "Test passes if the blue box is horizontally centered inside the black box."
      LayoutBlockFlow {DIV} at (0,34) size 198x198 [border: (3px solid #000000)]
        LayoutImage (floating) {IMG} at (51,3) size 96x96 [bgcolor=#0000FF]