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 (2.91,4) size 12x12
      LayoutText {#text} at (17,0) size 221x18
        text run at (17,0) width 221: "This checkbox should be checked."