Question
We found that we have 44 HTML errors in our website, which is not good in term of SEO, so can you please fix those and update me?
Answer
These validation errors typically do not affect appearance or functionality. They are most reflected in changes in standards for capitalization like onClick= vs. onclick=.
I am not aware that such errors affect SEO. It will be rather time consuming to change the full site to get to 100% validation with no visible benefits that I can see.
Many SEO consultants agree. Read more:
http://www.searchenginejournal.com/w3c-validation-for-seo-myth-and-reality/18566/
http://yoast.com/w3c-validation-seo/
Date Created: 02/14/14