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?
Technically, the xmlns attribute is used by the root element of an XHTML document: (according to Wikipedia) The root element of an XHTML document must be html, and must contain an xmlns …
HTML Versus XHTML - W3Schools
XHTML was developed to make HTML more extensible and flexible to work with other data formats (such as XML). In addition, browsers ignore errors in HTML pages, and try to display …
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:
XHTML - W3docs
On this page, you will find what is XHTML, read about its specificities, benefits and the main differences between XHTML and HTML/HTML5.
XHTML - Glossary | MDN
Nov 13, 2025 · XHTML is a term that was historically used to describe HTML documents written to conform with XML syntax rules. The following example shows an HTML document and …
Reference of Schema http://www.w3.org/1999/xhtml
XHTML 1.0 (Second Edition) Strict ... Submit a bug or a feature. Created by xsddoc, a sub project of xframe, hosted at http://www.sourceforge.net.
XHTML ™ 1.0: The Extensible HyperText Markup Language
Nov 24, 1999 · XHTML 1.0 provides the basis for a family of document types that will extend and subset XHTML, in order to support a wide range of new devices and applications, by defining …
Does HTML 5 need `<html xmlns="http://www.w3.org/1999/xhtml…
May 20, 2014 · HTML5 does not require the use of the xmlns attribute as that is specific to XHTML (which means not even HTML 4 uses it either). If you're just serving regular HTML5, …
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.