HTML 4.01 has evolved into a new markup language dubbed XHTML, based on the XML standard developed by the W3C. If you have never used XML, don’t fret; you only need to break a few bad habits to move from HTML to XHTML. If you want your Web pages to be compliant with future browsers, XHTML is the way to go. XHTML is provisioned to be the markup language for other user agents, including mobile phones, PDAs, pagers, and set-top boxes. XHTML could bulletproof your documents for various users and devices for years to come.
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