To follow up on the last comment by @Fear The Chorizo, I didn't realize what had really happened at the end of the Portugal / Croatia match. The video highlights I saw didn't have anything about the "chip in the ball" controversy.
https://www.espn.com/soccer/story/_/id/49256422/fifa-var-correctly-denied-croatia-equaliser-portugal
Apparently the technology in the ball indicated it was touched by a Croatian player, thereby causing his teammate to be offside. Here is a picture of the sensor in the ball, I guess:
Fair enough, but I would have liked to have seen the other touches after that. For example, the touch by the Portuguese player who headed it after that (I know that wouldn't have made #15 onside). They could also include some touches after that. That would show how it works in the context of other touches. Don't simply throw a random graph on there.
I didn't see it live -- did the AR call it offside?