http://www.htmlcinco.com/manual-html5-en-espanol/
Edge Tools & Services,
WebPlatform.org es
http://css.maxdesign.com.au/floatutorial/
http://webstandardsgroup.org/
http://www.whatwg.org/specs/web-apps/current-work/
http://www.whatwg.org/
http://css.maxdesign.com.au/