IFAB just approved new World Cup rules: players can be sent off for mouth-covering or walking off in protest. Guardian of the Laws of football since 1886.
IFAB has approved two amendments ahead of the World Cup: a red card may be issued to players covering their mouths in confrontations, and red cards may be issued to players or officials who leave the field in protest. The changes will apply at the World Cup and inform all 48 participating teams.