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+0 440 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 424 0+0+8] children: inline
      frag 0 from BlockContainer start: 0, length: 0, rect: [13,10 420x420] baseline: 422
      BlockContainer <button> at [13,10] inline-block [0+1+4 420 4+1+0] [0+1+1 420 1+1+0] [BFC] children: not-inline
        BlockContainer <(anonymous)> at [13,10] flex-container(column) [0+0+0 420 0+0+0] [0+0+0 420 0+0+0] [FFC] children: not-inline
          BlockContainer <(anonymous)> at [13,10] flex-item [0+0+0 420 0+0+0] [0+0+0 420 0+0+0] [BFC] children: inline
            frag 0 from ImageBox start: 0, length: 0, rect: [13,10 420x420] baseline: 420
            TextNode <#text> (not painted)
            ImageBox <img> at [13,10] [0+0+0 420 0+0+0] [0+0+0 420 0+0+0] children: not-inline
            TextNode <#text> (not painted)
            TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x440]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x424]
      PaintableWithLines (BlockContainer<BUTTON>) [8,8 430x424]
        PaintableWithLines (BlockContainer(anonymous)) [13,10 420x420]
          PaintableWithLines (BlockContainer(anonymous)) [13,10 420x420]
            ImagePaintable (ImageBox<IMG>) [13,10 420x420]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x440] [children: 0] (z-index: auto)
