What are cons if we do not care about validation of XHTML and CSS?

Posted by metal-gear-solid on Stack Overflow See other posts from Stack Overflow or by metal-gear-solid
Published on 2010-04-18T10:49:19Z Indexed on 2010/04/18 10:53 UTC
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XHTML

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css

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w3c

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web-standards

What are cons if we do not care about validation of XHTML and CSS?

In terms of development time,
Code debugging,
Cross browser compatibility,
website maintainability,
Future changes in website,
SEO ranking
Accessibility (Does validity increase accessibility)

I have to explain a client that Code validation is not just Fashion, it is beneficial for his site.

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