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 70 0+1+0] [BFC] children: not-inline
Box
at [10,10] [8+1+0 200 0+1+588] [8+1+0 52 0+1+8] [GFC] children: not-inline
BlockContainer at [11,11] [0+1+0 100 0+1+0] [0+1+0 50 0+1+0] [BFC] children: not-inline
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer) [0,0 800x72]
PaintableBox (Box) [9,9 202x54]
PaintableWithLines (BlockContainer.item) [10,10 102x52]
SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
SC for BlockContainer [1,1 798x70] [children: 0] (z-index: auto)