A nail-biting match between Croatia and Portugal sent fans into a frenzy after a controversial video assistant referee (VAR) review denied Croatia's game-tying goal, eliminating the team from the World Cup.

For the tournament, we are taking a look at the major incidents to examine and explain the process in terms of both VAR protocol and the laws of the game.

Portugal survived a late scare as Ronaldo's 68th-minute penalty and Ramos' 94th-minute header sent them through.