2.1.528 Part 1 Section 17.18.2, ST_Border (Border Styles)
a. The standard states that the thinThickLargeGap, thinThickMediumGap, and thinThickSmallGap border styles specify line borders consisting of a thin line contained within a thick line contained within a thick thin.
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Word uses these styles to specify line borders consisting of a thin line contained within a thick line.
b. The standard places no restrictions on when the inset and outset border styles should be honored.
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Word displays inset and outset borders using the single border style when the border is not a table border or when the resolved value of the tblCellSpacing element for a row is nil.
c. The standard states that the inset and outset border styles specify a line border consisting of an inset/outset set of lines around the parent object.
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Word displays these border styles as defined in the CSS2 specification [CSS-LEVEL2].
d. The standard states that custom is a valid enumeration value.
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In Word, if the enumeration value of an ST_Border simple type is custom, then the file is considered corrupt.