Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x56 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x40 children: inline
frag 0 from Box start: 0, length: 0, rect: [28,28 49.71875x0] baseline: 26
Box <div.button> at (28,28) content-size 49.71875x0 flex-container(row) [FFC] children: not-inline
BlockContainer <(anonymous)> at (28,17) content-size 49.71875x22 flex-item [BFC] children: inline
frag 0 from TextNode start: 0, length: 5, rect: [28,17 49.71875x22] baseline: 17
"Hello"
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x56]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x40]
PaintableBox (Box<DIV>.button) [8,8 89.71875x40]
PaintableWithLines (BlockContainer(anonymous)) [28,17 49.71875x22]
TextPaintable (TextNode<#text>)