[kupu-dev] hr size width

[bernhard]

Hello, kupu develpoers!

We are using Plone for our new Homepage and feature kupu as  
editor :-) I have a problem, though:
How can I prevent kupu from adding the attributes size="2" and  
width="100%" to hr tags?
Whenever I try to validate a "HTML 4.01 Strict" Page with a hr tag  
created by kupu the w3c Markup Validation Service Failes.

Thank you very much for your help!
Regards
Gogo. <g.bernhard at akbild.ac.at>
Academy of Fine Arts Vienna