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The W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available. As an alternative you can also try our non-DTD-based validator.
Learn HTML and CSS with w3Schools
12/7/2010 · A fast, simple tutorial from the leading Web developer instruction site W3Schools.com is the number one online education source for beginning Web developers. This book packages W3Schools content in an attractive two-color design that gets beginning Web developers and designers up and running with the core Web development technologies. To-the-point tutorials with clear examples and …
The W3C CSS Validation Service
Note: If you want to validate your CSS style sheet embedded in an (X)HTML document, you should first check that the (X)HTML you use is valid.