Marco Zehe wrote on his blog about better accessibility support in Firefox 3.1. There will be text attributes and spell checking support!. This means that assistive technologies now have access to the attributes of any text run on a page. This patch has been included in Firefox 3.1 Alpha 1 (Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1a1pre) Gecko/2008071803 Minefield/3.1a1pre).
Right now, accessibility has become dominant and more interesting for many people. Lot's of application are focusing on accessibility, for example WordPress 2.6