The standard, professional, and enterprise editions of CSE HTML Validator include search engine optimization tips and analysis. Be sure to take advantage of these features!
For search engine optimization discussion, visit our Site Promotion & SEO (Search Engine Optimization) forum. If you want to post a question, then you must first register for the forums.
CSE HTML Validator (standard edition and above) can generate a message with a page's keyword density. This can help you improve a web page's search engine ranking. The optional keyword density message can be used to help optimize a web page for certain keywords. This will make it more likely that the page appears in the search results (and appears higher) when the keywords are used in a search. However, be sure not to use keywords (or, for that matter, any search engine technique) in an "abusive" way or search engines may penalize the ranking.
NOTE: SEO experts typically suggest keeping important keyword densities between 1 and 4 percent.