You can extend only open polylines (unjoined first and last line or arc polyline segments). Either the first or the last edge extends as if it were a line or arc object.
Wide polylines extend so the centerline intersects the boundary. Because the ends of wide polylines are at a 90-degree angle, part of the end extends past the boundary if the boundary is not perpendicular to the extended segment. If you extend a tapered polyline segment, the width of the extended end is corrected to continue the original taper to the new endpoint. If this correction gives the segment a negative ending width, the ending width is forced to 0.
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