2.1.400 Part 1 Section 17.15.1.27, displayHorizontalDrawingGridEvery (Distance between Horizontal Gridlines)

a.   The standard says this element controls the number of horizontal grid units between horizontal grid lines.

In Word, this element controls the number of horizontal grid units between vertical grid lines.

b.   The standard states that the values of the val attribute are defined by the XML Schema integer datatype.

Word restricts the value of this attribute to be at least 0 and at most 127.