The Kunena team has announce the arrival of Kunena 7.0.4 [K 7.0.4] in stable which is now available for download as a native Joomla extension for J! 5.4.x/6.0.x. This version addresses most of the issues that were discovered in K 6.2 / K 6.3 / K 6.4 and issues discovered during the last development stages of K 7.0
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If joomla css file have not errors then W3C markup validator dont show nothing related to this file, so validation of Lev's link is valid and show errors in kunena css file. But most of this errors are related to CSS3 rules and validation is done on CSS2.1 standard. Not all CSS3 rules are valid in CSS2.1 standard and that's reason why these errors shown.
@quila: Hi,
You are right, in this cause. At the forum should be at least one W3C standard template. For example it will be the default template. This template must be W3C standard template. And the other or additional templates, let remain in CSS3. In order to demonstrate to visitors that you care about creating the correct pages. And this is the right decision! Do you agree with me?