HTML 5 Is the latest version.The HTML specification will no longer have a version number attached. The Web Hypertext Application Technology Working Group (WHATWG) version of the specification will be updated as additions are integrated. As a result, the HTML specification will henceforth just be known as HTML, and will be considered a "living standard."
"In practice, the WHATWG has basically been operating like this for years, and indeed we were going to change the name last year but ended up deciding to wait a bit since people still used the term 'HTML5' a lot," Ian Hickson, an HTML specification editor, said in a statement. "However, the term is now basically being used to mean anything Web-standards-related, so it's time to move on!"