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layer at (0,0) size 785x1016
  RenderBlock {HTML} at (0,0) size 785x1016
    RenderBody {BODY} at (8,8) size 1000x1000
layer at (50,166) size 321x18
  RenderBlock (positioned) {P} at (50,166) size 321x18
    RenderText {#text} at (0,0) size 321x18
      text run at (0,0) width 321: "You should see a single green square, with no red."
layer at (58,58) size 100x100
  RenderBlock (positioned) {DIV} at (8,8) size 100x100 [bgcolor=#FF0000]
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scrolled to 50,50