Web Page Validation
Validate your HTML files with W3C
Validate your CSS files with W3C
Validate your XHTML files with W3C
An XHTML document is validated against a Document Type Definition (DTD).
You can read more about XHTML validation in our
XHTML tutorial.
Validate your XML files with Internet Explorer
Validate your WML files with Internet Explorer
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W3Schools' Online Certification Program
The perfect solution for professionals who need to balance work, family, and career building.
More than 3500 certificates already issued!
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The HTML Certificate documents your knowledge of HTML, XHTML, and CSS.
The JavaScript Certificate documents your knowledge of JavaScript and HTML DOM.
The XML Certificate documents your knowledge of XML, XML DOM and XSLT.
The ASP Certificate documents your knowledge of ASP, SQL, and ADO.
The PHP Certificate documents your knowledge of PHP and SQL (MySQL).
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