Both version 1.x and 2.x of jQuery support "current-1 versions" (meaning the current stable version of the browser and the version that preceded it) of Firefox, Google Chrome, Safari, and Opera. The version 1.x also supports Internet Explorer 6 or higher. However, jQuery version 2.x dropped Internet Explorer 6–8 support (which represents less than 28% of all browsers in use) and can run only with IE 9 or higher.

Including the library
Usage styles
jQuery plug-ins
Browser support