Technique H49: screen reader support for sub and sup

Hi,

Technique H49 (Using semantic markup to mark emphasized or special 
text), which is currently not associated with a success criterion, 
contains an example with sub and sup elements. Sub and sup are also 
in the test procedures.
However, I just read in a report on accessibility of mathematics and 
science that screen readers can't tell the difference between sub and 
sup, so s<sup>n</sup> and s<sub>n</sub> are both rendered the same on 
a Braille display, namely as "an".
I think we should do some tests for screen reader support (both 
Braille and speech), and possibly adapt the user agent and assistive 
technology support notes.

Best regards,

Christophe


-- 
Christophe Strobbe
K.U.Leuven - Dept. of Electrical Engineering - SCD
Research Group on Document Architectures
Kasteelpark Arenberg 10 bus 2442
B-3001 Leuven-Heverlee
BELGIUM
tel: +32 16 32 85 51
http://www.docarch.be/ 


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