XHTML | XHTML Classes | XHTML FAQ

XHTML

XHTML 1.0 is the first step toward a modular and extensible web based on XML (Extensible Markup Language). It provides the bridge for web designers to enter the web of the future, while still being able to maintain compatibility with today's HTML 4 browsers. It is the reformulation of HTML 4 as an application of XML. It looks very much like HTML 4, with a few notable exceptions, so if you're familiar with HTML 4, XHTML will be easy to learn and use.

• XHTML tags are all lowercase.
• XHTML is a stricter, tidier version of HTML.
• Pages written in XHTML work well in most browsers.
• All tags, including empty elements, must be closed.
• XHTML is the reformulation of HTML 4.0 as an application of XML.
• The elements (tags) and attributes are almost identical to HTML.

Extensibility: Under HTML, an SGML (Standard Generalized Markup Language) application, the addition of a new group of elements requires alteration of the entire DTD (language specification). XML is a simplified subset of SGML. This greatly eases the development and integration of new collections of elements.

Portability: By the year 2002 as much as 75% of Internet access could be carried out on non-PC platforms such as palm computers, televisions, fridges, automobiles, telephones, etc. In most cases these devices will not have the computing power of a desktop computer, and will not be designed to accommodate ill-formed HTML as do current browsers (bloated with code to handle sloppy or proprietary HTML).

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