XHTML namespace - World Wide Web Consortium (W3C)
Sep 7, 2016 · The namespace name http://www.w3.org/1999/xhtml is intended for use in various specifications such as: Recommendations:
What does "<html xmlns="http://www.w3.org/1999/xhtml">" do?
@hey: So let me get this straight: If your first two lines are <html xmlns="http://www.w3.org/1999/xhtml"> <!DOCTYPE html> - then everything works fine. But if …
HTML Versus XHTML - W3Schools
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html …
XHTML - Wikipedia
The namespace URI for XHTML is http://www.w3.org/1999/xhtml. The example tag below additionally features an xml:lang attribute to identify the document with a natural language:
Reference of Schema http://www.w3.org/1999/xhtml
Submit a bug or a feature. Created by xsddoc, a sub project of xframe, hosted at http://www.sourceforge.net.
XHTML - Glossary | MDN
Nov 13, 2025 · Content-Type: application/xhtml+xml --> <?xml version="1.0" encoding="UTF-8"?> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <title> XHTML …
Namespace "http://www.w3.org/1999/xhtml" | XML Schema …
elements (50 global), complexTypes (45), simpleTypes (21), element groups (69), global attributes (4), attribute groups (68)
XHTML ™ 1.0: The Extensible HyperText Markup Language
Nov 24, 1999 · The namespace for XHTML is defined to be http://www.w3.org/1999/xhtml. There must be a DOCTYPE declaration in the document prior to the root element. If present, the …
Why <html xmlns="http://www.w3.org/1999/xhtml"> is …
Therefore, it is recommended that xmlns="http://www.w3.org/1999/xhtml" should always be included on the <html> tag, since it is the parser that determines how to interpret a document.
XHTML Vocabulary - World Wide Web Consortium (W3C)
Jan 27, 2010 · XHTML Modularization [XHTMLMOD] permits the development of XHTML modules and XHTML family markup languages. These modules and markup languages may, …