Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] [BFC] children: not-inline BlockContainer at [0,0] [0+0+0 50 0+0+750] [0+0+0 50 0+0+0] [BFC] children: not-inline Box at [0,0] [0+0+0 50 0+0+0] [0+0+0 50 0+0+0] [GFC] children: not-inline Box
at [0,0] [0+0+0 50 0+0+0] [0+0+0 50 0+0+0] [GFC] children: not-inline ImageBox at [0,0] [0+0+0 50 0+0+0] [0+0+0 50 0+0+0] children: not-inline ViewportPaintable (Viewport<#document>) [0,0 800x600] PaintableWithLines (BlockContainer) [0,0 50x50] PaintableBox (Box) [0,0 50x50] PaintableBox (Box
) [0,0 50x50] ImagePaintable (ImageBox) [0,0 50x50] SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto) SC for BlockContainer [0,0 50x50] [children: 0] (z-index: auto)