When is the use of XHTML required? How much of that still holds true today? Does it affect SEO in any way? What distinctions exist between HTML5 and XHTML? All of these are reasonable inquiries, which we will examine collectively below. Let's look at all you need to know about XHTML and dive in.We must first comprehend HTML and XML in order to truly understand XHTML. For this reason, let's go back all the way to the 1990s and start at the beginning. You ought to be better equipped to understand what we discuss if you comprehend the roots.