2.1.1358 Part 4 Section 5.1.7.12, sp3d (Apply 3D shape properties)
a. The standard does not describe default behavior when contourClr and extrusionClr child elements are unspecified.
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In Office, child element contourClr defaults to black and child element extrusionClr defaults to the front face color.
b. The standard does not describe default behavior when contour width is zero.
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In Office, if the contour width is zero, then no contour is presumed and contour color is ignored.