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 [1,1] [0+1+0 798 0+1+0] [0+1+0 270 0+1+0] [BFC] children: not-inline BlockContainer at [10,10] [8+1+0 780 0+1+8] [8+1+0 252 0+1+8] children: not-inline BlockContainer
at [11,11] [0+1+0 250 0+1+528] [0+1+0 250 0+1+0] children: not-inline ViewportPaintable (Viewport<#document>) [0,0 800x600] PaintableWithLines (BlockContainer) [0,0 800x272] PaintableWithLines (BlockContainer) [9,9 782x254] PaintableWithLines (BlockContainer
) [10,10 252x252] SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto) SC for BlockContainer [1,1 798x270] [children: 0] (z-index: auto)