 > Line boxes that contain no text, no preserved white space, no inline elements with
  > non-zero margins, padding, or borders, and no other in-flow content (such as images,
  > inline blocks or inline tables), and do not end with a preserved newline must be
  > treated as zero-height line boxes for the purposes of determining the positions of
  > any elements inside of them, and must be treated as not existing for any other purpose.

  So for the purpose of finding the baseline of the 2nd inline-block we 