Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x100 children: not-inline
    Box <body> at (0,0) content-size 800x100 flex-container(row) children: not-inline
      ImageBox <img> at (0,0) content-size 400x100 flex-item children: not-inline
      ImageBox <img.padded> at (600,0) content-size 200x100 flex-item children: not-inline
