SEO Tip 10: Make sure its valid!
- Ensure that each page validates with no errors – test the page against http://validator.w3.org/ and address every error or warning that it reports. Addressing every error or warning does not necessarily mean fixing it, although that would be the ideal. Do consider each error and warning and consider whether it is significant and whether you could do something to fix it. Be aware that some of the errors that the validator throws up can also prevent web-bots from fully extracting information from the page.