documentos html
http://ocw.udl.cat/enginyeria-i-arquitectura/introduccio-al-disseny-de-sistemes-web/practicas/Actividades%20de%20HTML%205.pdf http://www.ite.educacion.es/formacion/materiales/182/cd/guia/contenidos.html http://www.vectoraula.com/html5/ http://diveintohtml5.info/ http://www.whatwg.org/specs/web-apps/current-work/multipage/sections.html#the-article-element