Apparently Mozilla has taken the lead in HTML5 accessibility with Firefox. For HTML5 developers who care about accessibility this is good news.
From the article:
According to the HTML5 accessibility website, Firefox for Windows has zoomed ahead of its rivals regarding support for HTML5 accessibility. In the site’s tests, the browser scores an impressive 92/100. All other browsers score 24/100 or less, bar Safari for Mac, with a credible 74/100.