1 layer at (0,0) size 800x600
2 LayoutView at (0,0) size 800x600
3 layer at (0,0) size 800x600
4 LayoutBlockFlow {HTML} at (0,0) size 800x600
5 LayoutBlockFlow {BODY} at (8,8) size 784x584
6 LayoutBlockFlow {INPUT} at (4,3) size 13x13
7 LayoutText {#text} at (20,2) size 220x17
8 text run at (20,2) width 220: "This checkbox should be checked."