layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x436
  RenderBlock {HTML} at (0,0) size 800x436
    RenderBody {BODY} at (100,100) size 600x236
      RenderBlock {P} at (0,0) size 600x18
        RenderText {#text} at (0,0) size 469x18
          text run at (0,0) width 469: "Things should not jump around when the green square starts the transition."
layer at (100,134) size 202x202 clip at (101,135) size 200x200
  RenderBlock (relative positioned) {DIV} at (0,34) size 202x202 [border: (1px solid #000000)]
layer at (101,135) size 200x100
  RenderBlock (relative positioned) {DIV} at (1,1) size 200x100 [bgcolor=#80800033]
layer at (101,135) size 150x150
  RenderBlock (positioned) {DIV} at (1,1) size 150x150 [bgcolor=#008000]
