|Outer|:for |perpendicular lines|: the lines overhang by the full thickness of the line; for others, the border is pushed outside the boundaries of the object.

|Middle|: for |perpendicular lines|: the lines overhang by half the width of the line; for others, border is centered on the edge of the object.Polygons always use this mode.

|Inner|: for |perpendicular lines|: no extra overhang; for others, the border is pulled inside the boundaries of the object.