The W3C has a number of requirements for documents before they can be called true XHTML documents. Here's the list of requirements that documents must meet:
XHTML is designed to be displayed in today's browsers, and it works well (largely because those browsers ignore elements that they don't understand, such as <?xml?> and <!DOCTYPE> ). However, because XHTML is also XML, there are a number of differences between legal HTML and legal XHTML. |