Viewport <#document> at (0,0) content-size 800x600 children: not-inline BlockContainer at (1,1) content-size 798x270 [BFC] children: not-inline BlockContainer at (10,10) content-size 780x252 children: not-inline BlockContainer
at (11,11) content-size 250x250 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)