2.1.122 Part 1 Section 17.4.9, divId (Associated HTML div ID)

For additional notes that apply to this portion of the standard, please see the notes for divId, §; trPr, §; trPr, §

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

Word does not allow a value of 0 on this attribute.