item-0 at level 0: unspecified: group _root_
  item-1 at level 1: text: Test with three images in unusual formats
  item-2 at level 1: text: Raster in emf:
  item-3 at level 1: picture
  item-4 at level 1: text: Vector in emf:
  item-5 at level 1: picture
  item-6 at level 1: text: Raster in webp:
  item-7 at level 1: picture