layer at (0,0) size 800x600
  LayoutView at (0,0) size 800x600
layer at (0,0) size 800x600
  LayoutBlockFlow {HTML} at (0,0) size 800x600
    LayoutBlockFlow {BODY} at (8,8) size 784x584
      LayoutBlockFlow {INPUT} at (4,3) size 13x13
      LayoutText {#text} at (20,1) size 209x19
        text run at (20,1) width 209: "This checkbox should be checked."