XHTML 1.1 Tutorial

XHTML validation

A valid XHTML document is the document that conforms to the XHTML specification. Validation of the document can ensure that our document will be shown to the client in accurate result. However, the validation does not ensure cross-browser compatibility. It just verifies that the webpage constructed in XHTML meets the definition as it mentions in Document Type Declaration, usually called DTD. The validated XHTML must contain:

• The compatible DTD places at the very beginning of an XHTML document.
• The character encoding (lang tag)
• Common syntax as mention in previous section

To check if your XHTML meets the standard, the easiest way is running the validator from W3C Markup Validation Service, the W3C returns a small icon (as you can see on the introduction page of this tutorial.) You may place this icon on your document to show that the page conforms to web standards.

This tutorial is final project for INFSCI 2000, Fall 2004
Copyright 2004 School of Information Science, University of Pittsburgh