The latest version of our cart and the WYSIWYG editor uses one of the latest versions of HTML (the code that is used to make web pages) called
XHTML. This type of code structure has advantages over standard HTML, however it is a lot
stricter about mistakes in the code.
Because the WYSIWYG editor attempts to clean up these mistakes and the results might not be as immediately intended, this has caused some confusion for some clients. If you commonly create HTML by hand or using Dreamweaver or Frontpage, you may have run into this problem if you are not familiar with XHTML and CSS. To alleviate and prevent confusion, I suggest starting with a free tutorial on W3Schools.
W3Schools.com - XHTML Tutorialhttp://www.w3schools.com/xhtml/QUOTE
XHTML is a stricter and cleaner version of HTML.
In this tutorial you will learn the difference between HTML and XHTML. We will also show you how this Web site was converted to XHTML.
I know this will help as it has helped me immensely.