2.1.1687 Part 1 Section 22.1.2.77, oMath (Office Math)

a.   The standard allows adjacent oMath elements without any separation between them.

Word merges together adjacent oMath elements if they are not separated by a WordprocessingML br element.

b.   The standard allows nesting of oMath elements inside a math object argument or inside another oMath element.

Word fails to open a file with an oMath element inside a math object argument or inside another oMath element.

c.   The standard does not state that the hyperlink and smartTag elements are valid child elements of the oMath element.

Word allows these elements to be child elements of the oMath element.

d.   The standard allows math content to exist outside of any oMath element.

Word will not open a file which contains math content outside of any oMath element.

e.   The standard allows oMath to occur outside of any p element.

Word will not open a file where oMath occurs outside of any p element.

f.   The standard states that the oMath element is allowed where block level content is required.

Word does not allow the oMath element to be a child of the body, comment, customXml (Block-Level Custom XML Element), customXml (Cell-Level Custom XML Element), customXml (Row-Level Custom XML Element), docPartBody, endnote, footnote, ftr, hdr, sdtContent (Block-Level Structured Document Tag Content), sdtContent (Cell-Level Structured Document Tag Content), sdtContent (Row-Level Structured Document Tag Content), tbl, tc, tr, or txbxContent elements.