jQuery team
releases v.2 on 19-Apr-2013. This version leaves behind the older Internet
Explorer 6, 7, and 8 browsers. In return it is smaller, faster, and can be used
in JavaScript environments where the code needed for old-IE compatibility often
causes problems of its own. But don’t worry, the jQuery team still supports the
1.x branch which does run on IE 6/7/8. You can (and should) continue to use
jQuery 1.9 (and the upcoming 1.10) on web sites that need to accommodate older
browsers.
http://blog.jquery.com/2013/04/18/jquery-2-0-released/
