2.1.1764 Part 4 Section 14.4.7, right (Table Cell Trailing Margin Default)

a.   The standard specifies this additional element semantically equivalent to the end element ("[ISO/IEC-29500-1] §17.4.11; end").

Word ignores this element if the end element ("[ISO/IEC-29500-1] §17.4.11; end") is present as a sibling.