2.1.122 Part 1 Section 7.5.18.5, text:character-count
a. The standard defines the attribute text:character-count
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This attribute is not supported in Excel 2013, Excel 2016, or Excel 2019.
b. The standard defines the element <text:character-count>
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This element is not supported in PowerPoint 2013, PowerPoint 2016, PowerPoint 2019.