2.1.649 Part 1 Section 18.3.1.78, selection (Selection)

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a.   The standard does not specify a default value for the activeCell attribute.

Excel uses a default value of A1 for this attribute.

b.   The standard states that the values of the activeCellId attribute are defined by the XML Schema unsignedInt datatype.

Excel restricts the value of this attribute to be at most 8191.