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+0 800 0+0+0] [0+0+0 116 0+0+0] [BFC] children: not-inline BlockContainer at [8,8] [8+0+0 500 0+0+292] [8+0+0 100 0+0+8] children: not-inline BlockContainer
at [8,8] [0+0+0 100 0+0+400] [0+0+0 100 0+0+0] children: not-inline ViewportPaintable (Viewport<#document>) [0,0 800x600] PaintableWithLines (BlockContainer) [0,0 800x116] PaintableWithLines (BlockContainer) [8,8 500x100] PaintableWithLines (BlockContainer
) [8,8 100x100] SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto) SC for BlockContainer [0,0 800x116] [children: 0] (z-index: auto)