2.1.1215 Part 1 Section 20.1.2.3.1, alpha (Alpha)

a.   The standard states that the val attribute specifies the opacity as expressed by a percentage value.

Office uses the val attribute to specify a percentage value for several elements.

b.   The standard states that ST_PositiveFixedPercentage is read and written as a floating point value with a trailing percent sign.

Office will read in percentages formatted as floating point value with a trailing percent sign or as an integer 1000th of a percent without trailing percent sign, but only write out percentages as the latter.

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