XHTML
From Level 10 Wiki
Abbreviation for Extensible Hypertext Mark-up Language and is a hybrid of XML and HTML. Web pages designed in XHTML; XHTML is a proposed successor to HTML. As such, many consider XHTML as the current or latest version of HTML (check the link "Latest version of HTML" in [1]). However, XHTML is a separate recommendation; the W3C continues to recommend the use of XHTML 1.1, XHTML 1.0, and HTML 4.01 for web publishing, and HTML 5 is currently being actively developed.
