Back when I first heard of XHTML it seemed like a brilliant idea. Here was a type of mark-up with rules, and rules mean an excuse to be my normal perfectionist self. It wasn’t long before I’d converted all 200+ pages of my website to this beautiful, lower-case, tidy syntax and was getting the green light from the validator. However, nobody told me why I should be using XHTML or gave a reason for switching much beyond “XML, and thus XHTML, are the way of the future!”
Read more of this post: Choosing Between XHTML and HTML.