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layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
layer at (10,10) size 200x200
  RenderBlock (positioned) {DIV} at (10,10) size 200x200 [bgcolor=#0000FF]
layer at (20,20) size 180x180
  RenderBlock (positioned) {DIV} at (10,10) size 180x180 [bgcolor=#00FF00]
layer at (30,30) size 160x160
  RenderBlock (positioned) {DIV} at (10,10) size 160x160 [bgcolor=#FF0000]
    RenderText {#text} at (0,0) size 154x18
      text run at (0,0) width 154: "Should not see this text."
    RenderText {#text} at (0,0) size 0x0
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  RenderBlock (positioned) {DIV} at (10,10) size 140x140 [bgcolor=#FFFFFF]
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      text run at (0,0) width 122: "Should not see this"
      text run at (0,18) width 28: "text."
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      text run at (0,0) width 782: "Below are four boxes all within each other, and a box overlaping other boxes. The 3rd inner box is red, and has an opacity"
      text run at (0,18) width 765: "of zero, and the box within it is black and has an opacity of 0.5. As the third box has opacity zero, the inner black is not"
      text run at (0,36) width 684: "visible. The yellow block has opacity of 0.5, and is as the same level in the DOM tree as the 3rd inner box."