Is HTML and CSS Validation Important for SEO?

If you were a search engine, you would probably want to show pages in your results that were built with the proper protocols for the Internet.

Sites that are riddled with countless HTML and/or CSS validation errors will likely not appear as frequently in the search results as would pages that follow the proper syntax and validation protocols.  Even so, the effect is probably somewhat negligible when you consider the more than 200 indicators Google uses for ranking websites.

Content Management System Effect

Sometimes we see that the CMS is responsible for the invalid HTML or CSS, and that the problem can not be solved unless the entire theme, or design is changed.  This is where you would need to balance the time/cost benefit of fixing these errors, versus just leaving them until the site is fully overhauled.

SiteJuice uses the W3C (World Wide Web Consortium) to look for errors on your page based on the DOCTYPE specified.

About Ryan Kelly

Ryan is the founder and CEO of Pear Analytics and has helped hundreds of customers with their Internet marketing since 2003. He has spoken on various topics of SEO, Analytics and other marketing at conferences in New York, Chicago and Vancouver. Clients he has consulted include Sears, KMart, CareerBuilder and PEER 1 Hosting. Ryan currently teaches two Internet marketing classes at Trinity University in San Antonio.

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