411 REFERENCE · Wikibooks
XHTML/XHTML Validating
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Introduction
Validating is done through the W3C Markup Validation Service. The W3C allows the user to check the documents for conformance to XHTML.
The Website
The validating website is http://validator.w3.org/
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