Web Reference: Mar 13, 2017 · XHTML 2, currently in the drafting stages, is not backwards-compatible with XHTML 1.x. XHTML 2 will have lots of major changes to the way documents are written and structured, and even if you already have your site written in XHTML 1.1, a complete site rewrite will usually be necessary in order to convert it to proper XHTML 2. May 22, 2019 · If you have more questions to ask, or you know of more differences, feel free to edit. What is the difference between XHTML and HTML? Isn't XHTML merely a more strict version of HTML? And why are there different versions of XHTML if they all act the same? The root element of an XHTML document must be html, and must contain an xmlns attribute to associate it with the XHTML namespace. You see, it's important to understand that XHTML isn't HTML but XML - a very different creature. (ok, a kind of different creature) The xmlns attribute is just one of those things the document needs to be valid XML. Why?
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