No margin of error at the WC. Offside by a little toe is offside.
Once again, this "his foot/knee was offside" thing is ridiculous. For two reasons.
Firstly, if someone is running they have no control over where there feet and knees are. They can't suddenly stop moving their legs if they are protruding too far. They will fall over. Penalising someone for where they are in their stride is just stupid.
Secondly, a player judges an offside by looking across the line. they don't have sensors in their feet to judge if their boots are offside. Using feet and knees turns an offside trap, or the springing of one, into a lottery, rather than a skill of timing.
Oh yes, A third one. FIFA didn't want the introduction of VAR to create different rules for the games at different levels. Well these VAR offside rules do just that. There is no way any linesman in the world judges offside by looking at someone's feet, imo, certainly when they are running. Torsoes all the time. You want the same playing field at all levels, use technology to simply improve the way the game was managed. Don't use technology to be more accurate than neccessary to the detriment of the game.