2.1.35 Part 1 Section 17.2.1, background (Document Background)
a. The standard states that any element from the VML namespace or the drawingML namespace is allowed as a child of the background element.
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Word renders any drawingML specified as a background at the beginning of the document and not as a background.
b. The standard does not state which setting is applied when both the themeShade and the themeTint attributes are present.
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Word applies the themeTint setting when both of these attributes are present.