Strokes that form an enclosed area do not have a rendered termination. In particular, all rectangle and border edges, as well as all 360-degree arc edges, are not considered to have any termination. Arcs with sweep angles less than 360 degrees and lines do have terminations at both endpoints.Reference_Syntax.cap = “square | butt | round”
• square (default)The stroke terminates by rendering the end of the edge squarely beyond the edge’s endpoint a distance equal to one-half the edge’s thickness.
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• The stroke terminates by rendering the end of the edge with a semi-circle at the edge’s endpoint, having a radius equal to one-half the edge’s thickness.