2.1.1271 Part 1 Section 20.1.5.6, contourClr (Contour Color)
a. The standard allows contour width to be zero.
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In Office, if the contour width is zero, the color specified by this element is ignored.
b. The standard does not describe the interaction between contours and extrusions.
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In Office, the contour of a shape is a solid filled line which surrounds the outer edges of the shape, and the outline edges of the extrusion.