От: Валидация и google
Определено GOOGLE обича валиден код!!! Мисля, че всички можете да си го преведете:
"Google prefers valid code
Shaun Anderson conducted an interesting validation test; Does Google like valid code?.
This experiment included 4 pages with the same content but a mixture of valid and non-valid HTML and CSS.
The result was that Google picked up the page that had valid HTML and valid CSS and indexed this page over the rest."