2.1.553 Part 1 Section 17.18.78, ST_Shd (Shading Patterns)

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a.   The standard specifies an enumeration value "nil" with the same meaning as clear.

Word ignores value "nil" when used to specify properties of a paragraph or a run of text. Word treats the value "nil" as equivalent to not specifying shading when it is used to specify properties of a table, cell, or row.