2.1.1263 Part 1 Section 20.1.4.2.9, fill (Fill)
a. The standard states that the fill element defines the fill that is applied to the table as a whole.
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Office uses this element to affect the table as a whole only if parented by tblBg.
b. The standard allows group fills to be applied to a table.
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Office does not apply group fills to tables but instead uses a white background.