XHTML

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The Extensible HyperText Markup Language (XHTML) is form of web page markup language which is similar to HTML but adheres to stricter syntax rules, being based on XML. The specifications for XHTML are maintained by the W3C, who describe XHTML 1.0 as "a reformulation of HTML 4 as an XML 1.0 application".

The semantics of the XHTML 1.0 elements and their attributes are not defined separately from those for HTML, being the same as those in the W3C Recommendation for HTML 4.This makes XHTML compatible with existing HTML user agents, if certain guidelines are followed.