Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x60 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x44 children: inline
      frag 0 from AudioBox start: 0, length: 0, rect: [8,8 300x40] baseline: 40
      frag 1 from TextNode start: 0, length: 1, rect: [308,34 8x18] baseline: 13.796875
          " "
      frag 2 from AudioBox start: 0, length: 0, rect: [316,48 0x0] baseline: 0
      AudioBox <audio> at (8,8) content-size 300x40 children: not-inline
      TextNode <#text>
      AudioBox <audio> at (316,48) content-size 0x0 children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x60]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x44]
      AudioPaintable (AudioBox<AUDIO>) [8,8 300x40]
      TextPaintable (TextNode<#text>)
      AudioPaintable (AudioBox<AUDIO>) [316,48 0x0]
