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.
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<!--..--><!DOCTYPE><a><abbr><acronym><address><applet><area><b><base><basefont><bdo><big><blockquote><body><br><button><caption><center><cite><code><col><colgroup><dd><del><dfn><dir><div><dl><dt><em><fieldset><font><form><frame><frameset><head><h1>-<h6><hr><html><i><iframe><img><input><ins><kbd><label><legend><li><link><map><menu><meta><noframes><noscript><object><ol><optgroup><option><p><param><pre><q><s><samp><script><select><small><span><strike><strong><style><sub><sup><table><tbody><td><textarea><tfoot><th><thead><title><tr><tt><u><ul><var>
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