The World Wide Web Consortium (W3C) is an international community that works to develop Web standards. The Markup Validation service is offered by the W3C to check the markup validity of Web documents in HTML, XHTML, SMIL, MathML, and more. Developers can use the API to access the functionality of the service and integrate it with their own applications. The API uses SOAP protocol and responses are formatted in XML.
The following is a list of how-to and tutorial content that matched your search term. ProgrammableWeb's how-to content comes from two sources; full-blown tutorials that we publish ourselves and other highly relevant tutorials that we find elsewhere on the Web. This list represents on combination of both tutorial types and if you go to ProgrammableWeb's API University, you'll not only be able to find more, they are organized based on your role (API providers or developers who consumes APIs). If you know of a tutorial that would be of interest to the ProgrammableWeb community, we'd like to know about it. Be sure to check our guidelines for making contributions to ProgrammableWeb.