Cascading Style Sheets  skip to content   What is XHTML?
eXtensible Hypertext Markup Language, a type of HTML that is
compatible with XML. HTML is not strict enough to be compatible
with XML, so XHTML was made to bridge the gap.  XHTML is a
standard and pages written in XHTML should validate.  Why are
standards and XHTML important?  Would you build a car with
concrete wheels for a rubber highway? Then why should browser
developers (IE) get to create their own standards?  Web
developers have enough trouble battling with the various
browser's interpretation of HTML code. As a developer when your
code is written in valid XHTML you can take a stand and say here
is valid (and validated) code that should display as expected.
Having validated code that also takes advantage of CSS is also a
great way to ensure accessibility.