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A goal must be placed on the center of each goal line between the corners. If, the painted line is a different width than the goal post, then the back edge of the post should be aligned with the outside edge of the line, meaning the goal post should not be out of bounds.
The ball is out of play when it has wholly passed over the goal line or touchline on the ground or in the air. So, think of the lines as the bottom of a wall that continue infinity into the sky. Ultimately, it is the judgment call of the referee, so play until you hear a whistle.