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W3C Markup Validation Service
The Markup Validation Service by the World Wide Web Consortium, W3C, allows internet users to check HTML documents for conformance to their HTML and XHTML standards. Although HTML files will render regardless of errors in major browsers, they often contain many structure and/or form errors.
Information are taken from Wikipedia, the open encyclopedia, to which contribute many volunteers from around the whole world. Texts are available under the following conditions GNU Free Documentation License.
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