Start Validating number in perl

Validating number in perl

XHTML 1.0 became a World Wide Web Consortium (W3C) Recommendation on January 26, 2000.

Secondly however, because the expressible contents of the DOM in syntax are slightly different, there are some changes in actual behavior between the two models.

The Document Object Model (DOM) is a tree structure that represents the page internally in applications, and XHTML and HTML are two different ways of representing that in markup (serializations).

Both are less expressive than the DOM (for example, "--" may be placed in comments in the DOM, but cannot be represented in a comment in either XHTML or HTML), and generally XHTML's XML syntax is a little more expressive than HTML (for example, arbitrary namespaces are not allowed in HTML).

HTML 4 was ostensibly an application of Standard Generalized Markup Language (SGML); however the specification for SGML was complex, and neither web browsers nor the HTML 4 Recommendation were fully conformant to it.

There are various differences between XHTML and HTML.

In January 2009 a second edition of the document (XHTML Media Types – Second Edition) was issued, relaxing this restriction and allowing XHTML 1.1 to be served as Since information appliances may lack the system resources to implement all XHTML abstract modules, the W3C defined a feature-limited XHTML specification called XHTML Basic.

It provides a minimal feature subset sufficient for the most common content-authoring.

In the current XHTML 1.0 Recommendation document, as published and revised to August 2002, the W3C commented that, "The XHTML family is the next step in the evolution of the Internet.