See other issue: RT-12971, for code example and demo and demo URL. During this test, I also noticed, that bold text (<b>) sometimes is very hard to distinguish from non-bold text, especially with small fonts. For a clear example on this, open this URL

http://www.tizag.com/htmlT/htmlbold.php

and look to the menu on the left. Compare the result with, how it for instance is rendered in Google Chrome. It's very difficult to see the bold markings from the non-bold markings.The bold markings need to be much more clear.