This question already has an answer here:
During the penalty shootout of Croatia vs Denmark of World Cup 2018, in Croatia's 2nd shot (Andrej Kramarić vs Kasper Schmeichel), when Kramarić was running for a shot, he paused briefly before continued to run for the shot, then shot and scored a goal. Schmeichel fell for the trick, thus missed the ball. Right after the goal, Schmeichel showed expression claiming Kramarić's procedure was a foul/invalid conduct. However the referee acknowledged his goal and let the match continue.
My question is: In FIFA's rules, during a penalty shootout, is it a foul or misconduct if a shooter pauses briefly while running or before a shot to trick the goalkeeper?
(A note: I do recall reading the rule somewhere, stating that the mentioned "trick" is indeed a foul for unsportmanlike conduct, but I cannot find the source or citation anymore. I might have remembered it wrong, though.)