Today, the project found a few pictures do have inexplicable gaps below, but a closer look is not a div wrapped 3 img do? Nothing to do margin ah, a few hair loss, check no clue, try to set the row height, one less px. Ok. . . It seems the matter is not simple.
After verification, reason: img is inline elements, due to problems resulting from the baseline.
Solution:
1.img set to block-level elements
2.img vertical-align to top