2.1.583 Part 1 Section 19.264, form:datasource
a. The standard defines the attribute form:datasource, contained within the element <form:form>
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This attribute is not supported in Word 2013, Word 2016, or Word 2019.
b. The standard defines the attribute form:datasource, contained within the element <form:form>
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This attribute is not supported in Excel 2013, Excel 2016, or Excel 2019.