The "Feature" section (with links labeled "Graceful Degradation", "Semantic Action Creation", etc) are all 404s since they're missing the 'http://'.

The Graceful degradation link, for example, goes to http://www.tuxedojs.org/www.tuxedojs.org/docs/TuxModularity instead of http://www.tuxedojs.org/docs/TuxModularity.