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+0 120 0+1+0] [BFC] children: not-inline BlockContainer at [10,10] [8+1+0 54 0+1+734] [8+1+0 102 0+1+8] children: not-inline Box at [11,11] flex-container(column) [0+1+0 52 0+1+0] [0+1+0 100 0+1+0] [FFC] children: not-inline BlockContainer at [12,12] flex-item [0+1+0 50 0+1+0] [0+1+0 18 0+1+0] [BFC] children: inline frag 0 from TextNode start: 0, length: 5, rect: [12,12 39.78125x18] baseline: 13.796875 "Hello" TextNode <#text> (not painted) BlockContainer <(anonymous)> (not painted) [BFC] children: inline TextNode <#text> (not painted) ViewportPaintable (Viewport<#document>) [0,0 800x600] PaintableWithLines (BlockContainer) [0,0 800x122] PaintableWithLines (BlockContainer) [9,9 56x104] PaintableBox (Box

.flex) [10,10 54x102] PaintableWithLines (BlockContainer

.hmm) [11,11 52x20] TextPaintable (TextNode<#text>) SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto) SC for BlockContainer [1,1 798x120] [children: 0] (z-index: auto)