How_to

It appears that the most significant difference between HTML and XHTML is the structure. XHTML, to be properly formatted and validated, is a strict language. HTML is a bit more relaxed and will accept a more flexibly written program. However, XHTML requires a very strictly structured program. For example, XHTML tagging is case sensitive so a tag such as  would not be accepted in this language while HTML would overlook it.

 5. While the dog was eating he noticed noticed it was cat food.
 * __HTML__

http://www.w3schools.com/xhtml/xhtml_html.asp http://wiki.whatwg.org/wiki/HTML_vs._XHTML#Differences_Between_HTML_and_XHTML http://wdvl.internet.com/Authoring/Languages/XML/XHTML/dif.html