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The HTML or XHTML is conform to one of the current DTD supplied by the W3C. With regards to this please go to: la structuration des documents HTML-XHTML (tutoriels OpenWeb) ;
The CSS code is conform to the standards CSS1 and/or CSS2. With regards to this please go to: la mise en page (tutoriels OpenWeb) ;
The scripts respect the standards DOM1 and/or DOM2. With regards to this please go to: les pages dynamiques (tutoriels OpenWeb).
HTML validators : http://validator.w3.org/
http://www.htmlhelp.com/tools/validator/
http://www.validome.org/
CSS validators : http://jigsaw.w3.org/css-validator/
http://www.htmlhelp.com/tools/csscheck/