2.1.1401 Part 1 Section 21.1.2.3.13, uFillTx (Underline Fill Properties Follow Text)

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a.   The standard states that the uFillTx element specifies the fill color of an underline and should be the same color as the run of text within which it is contained.

In Office, the uFillTx element specifies that the fill color and all other fill properties of an underline are the same as the run of text within which it is contained.