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