Overleg:Extensible HyperText Markup Language

XHTML is geen tussenvorm tussen HTML en XML. XHTML is zuivere XML (want het voldoet volledig aan de XML specificaties), die bedoeld is om documenten in een aantal verschillende apparaten te tonen. Daaronder vallen browser op een computer, maar ook mobiele telefoons en navigatiesystemen.

In de woorden van W3C: "The Extensible HyperText Markup Language (XHTML™) is a family of current and future document types and modules that reproduce, subset, and extend HTML, reformulated in XML. XHTML Family document types are all XML-based, and ultimately are designed to work in conjunction with XML-based user agents. XHTML is the successor of HTML, and a series of specifications has been developed for XHTML." (http://www.w3.org/MarkUp/).