Are we also including Goal line technology? I agree with earlier poster saying if there is no daylight between the bodies is a good standard although it then comes down to determining if there is space or not but it would cover the majority of situations. I would also say for those instances if it’s not obvious, they give benefit of doubt to the attacker. Quick look, “oh look at that gap” OFFSIDE. Clearly no gap, ONSIDE. “Oh there might be a gap, I’m not sure” ONSIDE. should be matter of a few seconds none of this red and green lines microscopic analysis. As four fouls etc still going to come to opinions a lot, I think.