2.1.915 Part 1 Section 19.823, text:key1-phonetic

a.   The standard defines the attribute text:key1-phonetic, contained within the element <text:alphabetical-index-mark>

This attribute is not supported in Word 2013, Word 2016, or Word 2019.

b.   The standard defines the attribute text:key1-phonetic, contained within the element <text:alphabetical-index-mark-start>

This attribute is not supported in Word 2013, Word 2016, or Word 2019.