2.1.554 Part 1 Section 17.18.84, ST_TabJc (Custom Tab Stop Type)

a.   The standard states that the decimal value specifies that the current tab stop shall result in a location in the document where all following text is aligned around the first decimal character in the following text runs.

In Word, if the value is decimal, the tab stop results in a location in the document where all following text is aligned around the first decimal separator in the following text runs.

b.   The standard does not state how to interpret the decimal attribute if there is no decimal separator.

Word aligns text around the implicit decimal separator after the last digit of the first numerical value appearing in the following text if there is no decimal separator.

c.   The standard does not list "left" or "right" as valid values for the val attribute.

Word treats a value of "left" as if it were "start".  Word treats a value of "right" as if it were "end".

d.   The standard does not describe the behavior when a table cell contains a single decimal tab stop.

Word will insert an implicit tab into the table cell when there is a single decimal tab stop, which results in the content being aligned to the decimal tab stop automatically.

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