2.1.1626 Part 1 Section 21.4.3.7, spPr (Shape Properties)
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For additional notes that apply to this portion of the standard, please see the notes for spPr, §20.5.2.30(a-c).
a. The standard states that the grpFill element is a valid child of the spPr element.
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Office will display an empty (invisible) shape fill for any diagram shape with a group fill, regardless of the fill of the parent group.