Is a slide tackle legal

Answer 1

A legal slide tackle may come from any direction, although one from behind is harder to execute cleanly. Making contact with the ball before the opponent is a requirement for any legal tackle, but there are others.

Does the player raise a leg or hook with their laces to trip the opponent after ball contact? This would be a foul.

Answer 2

A properly performed slide tackle is allowed under the FIFA Laws of the Game.

Some recreational and coed leagues have modified the laws to disallow slide tackling.