2.1.303 Part 1 Section 17.11.10, footnote (Footnote Content)

For additional notes that apply to this portion of the standard, please see the notes for endnote, §17.11.2(a); oMath, §; oMathPara, §

a.   The standard states that the id attribute is used to match the contents of a footnote or endnote using the footnoteRef or endnoteRef element.

Word uses this attribute to make this match using the footnoteReference/endnoteReference elements.