Hi HTML experts can you tell me why? HTML introduces advanced versions, what are the advantages of advanced versions?????
There are a lot of threads available on DP; just do a search or you can even search on Google. You'll have all of your questions answered.
You're looking for the advantages of HTML5. A quick search on Google will yield thousands of results and its already been answered a handful of times right here on DigitalPoint. Look it up.
He is not maybe asking about HTML 5 version but maybe HTML codding with best practices. XHTML 1.0 Strict will not die so soon. Anyway, having your web pages codded in advanced skills gives you benefits like good and fast pages speed load, some SEO benefits, and of course a prestige.
Are you asking as suggested why there is an HTML 4.01 and an XHTML? If that is the case perhaps this article will help out a little with that http://www.webstandards.org/learn/articles/askw3c/oct2003/ hope this helps