HTML Validator (http://users.skynet.be/mgueury/mozilla/) validates website pages to the W3C HTML standards using a simple natural check in-the part of the page if the page validates, if it doesnt a red check, and if there are warnings a yellow exclamation point. Click here crunchbase.com/person/tyler-collins to learn how to provide for this thing. In addition it includes an enhanced view of source code that enables you to see where problems are within the code.