The same as everybody else: according to the IFAB Laws of the Game.
The same as everywhere else: according to the IFAB's Laws of the Game.
The highest governing body in world soccer is the International Football Association Board, or IFAB. The IFAB are the custodians of the seventeen Laws of the Game, and meet annually to discuss proposed updates to the Laws and other matters that impact the world of soccer on the highest levels. The IFAB is composed of the Fédération Internationale de Football Association (FIFA, the largest soccer association in the world) and the four pioneering soccer associations in the UK: England's Football Association (the FA), the Scottish Football Association (SFA) the Football Association of Wales (FAW), and the Irish Football Association (IFA) of Northern Ireland.
The International Football Association Board (IFAB) meets annually to discuss proposed changes to the Laws, Advice to Referees, new player tactics and how they relate to the Spirit of the Game, and other matters concerning global soccer. Most recently, the IFAB voted in 1998 to make fierce tackles from behind qualify for Serious Foul Play, a sending-off offense.
Soccer rules are codified into the 17 "Laws of the Game" (LotG), which are revised annually by the International Football Association Board (IFAB) and published by FIFA. The Laws change sometimes. You can find the most recent version at the FIFA.com website.
The Laws of the Game were most-recently revised in Zurich, Switzerland during the 2010 General Meeting of the International Football Association Board (IFAB).
Soccer players should not wear helmets because they are not an authorized part of a player's equipment under Law 4 of the IFAB's Laws of the Game, the rules the world plays by. This is because in soccer, actions which might cause head injury are disallowed, unlike in American (Gridiron) football, where players would be at a substantial and imminent risk without their helmet.
FIFA does not have laws. The Laws of the Game are curated by the International Football Association Board (IFAB), and are published annually by FIFA. Those Laws of the Game do not specify any such thing as a "safety margin".
What do you mean by "Who likes play soccer?"
If you mean "How do you SAY soccer in Japanese?", then the answer is "sakkā".
past the soccer ball
soccer? don't you mean football? soccer isn't played in the UK