Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] [BFC] children: not-inline
  BlockContainer <html> at [0,0] [0+0+0 800 0+0+0] [0+0+0 36 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 20 0+0+8] children: inline
      frag 0 from Box start: 0, length: 0, rect: [8,8 23.671875x20] baseline: 16
      Box <div.flex> at [8,8] flex-container(row) [0+0+0 23.671875 0+0+0] [0+0+0 20 0+0+0] [FFC] children: not-inline
        BlockContainer <(anonymous)> (not painted) [BFC] children: inline
          TextNode <#text> (not painted)
        BlockContainer <span.tall> at [8,8] flex-item [0+0+0 17.828125 0+0+0] [0+0+0 20 0+0+0] [BFC] children: inline
          frag 0 from TextNode start: 0, length: 1, rect: [8,8 17.828125x20] baseline: 16
              "A"
          TextNode <#text> (not painted)
        BlockContainer <(anonymous)> (not painted) [BFC] children: inline
          TextNode <#text> (not painted)
        BlockContainer <span.short> at [25.828125,16] flex-item [0+0+0 5.84375 0+0+0] [0+0+0 10 0+0+0] [BFC] children: inline
          frag 0 from TextNode start: 0, length: 1, rect: [25.828125,16 5.84375x10] baseline: 8
              "B"
          TextNode <#text> (not painted)
        BlockContainer <(anonymous)> (not painted) [BFC] children: inline
          TextNode <#text> (not painted)
      TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x36]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x20]
      Paintable (Box<DIV>.flex) [8,8 23.671875x20]
        PaintableWithLines (BlockContainer<SPAN>.tall) [8,8 17.828125x20]
        PaintableWithLines (BlockContainer<SPAN>.short) [25.828125,16 5.84375x10]

SC for Viewport<#document> [0,0 800x600] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x36] (z-index: auto)
