layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
      RenderBlock {INPUT} at (3,3) size 13x13
      RenderText {#text} at (19,0) size 218x19
        text run at (19,0) width 218: "This checkbox should be checked."
