2.1.166 Part 4 Section 2.4.60, tblW (Preferred Table Width Exception)
a. The standard specifies that this element specifies the preferred width for the parent table row.
Word ignores this element if it is not present in the first row of the table. If it is in the first row, Word applies this preferred width to the entire table.
b. The standard specifies that if w is 0, the preferred table width is 0.
Word interprets the type attribute as auto if w is 0.
c. The standard states that if the tblW element is omitted, then the cell width is auto.
In Word, if the tblW element is omitted, then the table width is determined by the preferred table width element.
d. The standard does not specify the behavior when the type attribute is nil.
Word interprets the type attribute value as auto when the type attribute has a value of nil.