Based on this thread
https://lists.linux-foundation.org/pipermail/accessibility-ia2/2009-March/000765.html
I added this paragraph to the text-position text attribute:

Also consider the case of the html snippet, x<sup>a<sub>i</sub></sup>. A
super or sub text attribute refers to the base line of the prior
character which in turn may itself be offset from the baseline of the
character in front of it.

-- 
*Pete Brunet*
                                                                
a11ysoft - Accessibility Architecture and Development
(512) 467-4706 (work), (512) 689-4155 (cell)
Skype: pete.brunet
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http://www.a11ysoft.com/about/
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