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All modern browsers understand HTML, so what is the point of being XHTML compliant other then writing more characters found on the far right side of the keyboard.
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XHTML was developed to make HTML more extensible and flexible to work with other data formats (such as XML). In addition, browsers ignore errors in HTML pages, and try to display the website even if it has some errors in the markup.
Need for XHTML : XHTML has a more strict syntax rules in comparison of HTML. XHTML gives you a more consistent, well structured format so that your webpages can be easily parsed and processed by present and future web browsers. It also makes your website more easy to maintain, edit, convert and format in the long run.
Yes unfortunately XHTML is gone.
Features of XHTML: Unlike HTML, which is standard generalized markup language based, XHTML is XML-based. Compared to the rules of HTML, XHTML is stricter and does not allow any lapses in coding or structure. It prohibits the omission of any tags or usage of attribute minimization.
There is no point that I can think of. The W3C has canceled XHTML 2.0, although there is supposed to be an XHTML5, which I guess is HTML5 for masochists. Originally XHTML was going to lead us into the world of "correct" HTML documents, but it generated as many (or more) problems than it ever solved.
We validate against either HTML 4.01 Transitional or HTML5 (to the degree that you can do that). That plus clean CSS gives you about the best you can shoot for.
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XHTML was originally supposed to be a "next generation of HTML", as well as a stricter version of HTML (which would cause failures if any error showed up in the page). Due to a variety of loopholes and any number of other issues with XHTML (such as pages serving up the wrong mimetype), hardly any pages are actually XHTML, they're just HTML with some extra characters.
Eventually, HTML5 was proposed, w3c split into two groups, then the people working on XHTML 2.0 switched to something better (HTML5) and now everyone is talking about HTML5 taking over everything.
For a longer version (with far more detail), check out this chapter from Dive Into HTML5: http://diveintohtml5.ep.io/past.html
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