2.1.1641 Part 1 Section 22.1.2.15, brk (Break)

a.   The standard allows any value for alnAt between 1 and 255.

Word requires the value of alnAt to be less than the index of the first operator in the equation with a manual break.

b.   The standard allows brk element to be specified for any math run.

Word ignores brk if it is specified for a math run which does not begin with an operator.

c.   The standard says the alignAt attribute specifies how to align the current line of the equation with the previous line of the equation.

In Word, the alignAt attribute specifies how to align the current line of the equation with the first line of the equation.

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