2.1.399 Part 1 Section 220.127.116.11, displayVerticalDrawingGridEvery (Distance between Vertical Gridlines)
a. The standard says this element controls the number of vertical grid units between vertical grid lines.
In Word, this element controls the number of vertical grid units between horizontal grid lines.
b. The standard states that, if this element is omitted, no vertical gridlines are displayed.
In Word, if this element is omitted, horizontal gridlines are displayed for every vertical grid unit.
c. 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.