2.1.398 Part 1 Section 17.15.1.24, defaultTableStyle (Default Table Style for Newly Inserted Tables)

For additional notes that apply to this portion of the standard, please see the notes for numStyleLink, §17.9.21(a).

a.   The standard states that if this element is not specified then the application shall apply the default table style for inserted table

Word will apply the TableGrid style for tables when this element is not specified

b.   The standard does not limit the length of the value of the val attribute.

Word restricts the value of this attribute to be at most 253 characters.