why is this nav broken on firefox?

Can you guys point out what I am doing wrong on with the navigation on this site? It works fine on webkit, but not 开发者_Go百科firefox!

http://datatables.dyndns-web.com/

vs intended

The NAV-tag isn't a block-element by default in current versions of Presto, Trident and Gecko. Only WebKit has a default stylesheet for HTML5-elements included already. You should use a basic-/reset-CSS to format all HTML5-elements.

See: http://html5doctor.com/html-5-reset-stylesheet/

BTW, if someones asking for an image, you should upload an image of the desired result, not one of the broken view…