You keep hearing about it…
HTML vs XHTML – What’s the difference?

XHTML is a new, stricter and cleaner version of HTML aimed to replace HTML. It is the official HTML standard set by W3C recommendation in 2000.

The main differences:
• XHTML elements must be properly nested
• XHTML documents must be well-formed. No sloppy code is allowed.
• Tag names must be in lowercase
• All XHTML elements must be closed

To build an XHTML site you’ll need the following resources:
• W3Schools really easy XHTML Tutorial
• The w3C (X)HTML validator – to test your site
• XHTML 1.0 Reference
• XHTML 1.0 Standard Attributes
• XHTML 1.0 Event Attributes – for your javascript
• XML Tutorial – how to use it in your apps