An often over looked factor in SEO is that of HTML validation. If you have poorly coded HTML it may hinder achieving good search engine rankings as it may affect spidering, keyword results and other on page factors. In addition to thsi it may also have a negative impact in your visitor experience – poor load times, incorrectly formatted pages etc.
For these reasons it is important that you run your pages and sites through a HTML validator – ours is free so why not give it a go !