jQuery’s migration support plan for Internet Explorer was announced back in June 2012 making it clear to JavaScript developers that the popular framework would no longer support IE versions 8 and below. While version 1.9 and beta 2.0 both share the same API while version 1.9 will support IE 6, 7 and 8, the plan is for jQuery 2.0 to only support IE 9 or up. Read the full release information here.