    def _reset_spacing(self, side):
        """Set to 0 the margin, padding and border of ``side``."""
        self.remove_decoration_sides.add(side)
        setattr(self, f'margin_{side}', 0)
        setattr(self, f'padding_{side}', 0)
        setattr(self, f'border_{side}_width', 0)
Set to 0 the margin, padding and border of ``side``.
weasyprint/formatting_structure/boxes.py