Any goal scored or created with the use of the hand or arm will be disallowed this season even if it is accidental.
The handball rule now has extra clarity because it does not consider intent by a player.
Another big change is to do with the position of a player's hand/arm.
If the ball hits a player who has made their body "unnaturally bigger" then a foul will be awarded.
IFAB says that having the hand/arm above shoulder height is rarely a "natural" position and a player is "taking a risk" by having the hand/arm in that position, including when sliding.
It is, however, considered natural for a player to put their arm between their body and the ground for support when falling, so long as the arm is not extended to make the body bigger.