Maignan included a link to a story from 2023 about new rules from football’s law-makers Ifab, stating that goalkeepers are not allowed to do anything that “unfairly distracts the kicker”, such as touching the posts or crossbar.
They were already required to have “at least part of one foot touching, in line with, or behind, the goalline” when the ball is kicked.
Penalty takers are allowed to feint their run-up, but cannot feint taking the kick once the run-up is complete.
Maignan, who has 19 caps, is playing in his first major tournament for France after long-time number one Hugo Lloris retired after the 2022 World Cup.
Their last-16 match will take place in Dusseldorf on Monday, with their opponents to be confirmed after Wednesday’s final group games.