WikkaWiki is neither xhtml 1.0 compliant or css 2.1 compliant. Just view the source of this page and you will see text that is not within tags just hanging out, and also frequent use of deprecated html (like color = whatever) rather than proper css styling. It may be a dream for Wikka but it's far from reality.

Valid XHTML 1.0 Transitional
http://validator.w3.org/check?uri=http%3A%2F%2Fwikkawiki.org%2FWikkaStandards%3Fshow_comments%3D1%26showall%3D1

This document validates as CSS
http://jigsaw.w3.org/css-validator/validator?uri=http://wikkawiki.org/WikkaStandards?show_comments=1&showall=1

Please give evidence of any deprecated HTML tags used in Wikka to support your claim.