2.1.1642 Part 1 Section 22.1, Math

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a.   The standard specifies that the ruby element is allowed inside math.

Word exhibits unpredictable behavior if the ruby element is included inside math, including failing to open the document.

b.   The standard specifies that comments are allowed inside math.

In Office, unpredictable behavior occurs when comments are included inside math.

c.   The standard specifies that the pict element is allowed inside math.

Word exhibits unpredictable behavior when the pict element is included inside math, including failing to open the document.