2.1.1318 Part 1 Section 18.104.22.168, ST_TextCapsType (Text Cap Types)
a. The standard states that the small value converts all letters to lower case.
In Office, the small value converts all lower-case letters into upper-case letters of a smaller font size. The actual point size in the backing store is not affected.
b. The standard does not clearly define the none value of the ST_TextCapsType simple type.
Office uses this value to specify that no capitalization effects should be applied during text display and to override capitalization effects specified in styles.
c. The standard states that the all value converts all letters to upper case.
In Office, the all value causes text to be displayed as upper case and the original text remains unchanged in the file.