 Version 2.2 updated and improved integration with W3C standards such as HTML5, SSML, PLS, CSS, ARIA, and MathML, and otherwise made relatively small changes to the Version 2.1 core specification.Version 2.x is a significant improvement on Version 1, defining a new underlying interaction model.It is also notable for its significantly greater degree of integration with other specifications (some of which did not exist during the production of v1)