Current Active Support
|jQuery 1.x||6+||(Current - 1) or Current||(Current - 1) or Current||5.1+||12.1x, (Current - 1) or Current|
Any problem with jQuery in the above browsers should be considered and reported as a bug in jQuery.
(Current - 1) or Current denotes that we support the current stable version of the browser and the version that preceded it. For example, if the current version of a browser is 24.x, we support the 24.x and 23.x versions.
12.1x, (Current - 1) or Current denotes that we support Opera 12.1x as well as last 2 versions of Opera. For example, if the current Opera version is 20.x, we support Opera 12.1x, 19.x and 20.x but not Opera 15.x through 18.x.
While jQuery might run without major issues in older browser versions, we do not actively test jQuery in them and generally do not fix bugs that may appear in them.
About Browser Support
jQuery is constantly tested with all of its supported browsers via unit tests. However, a web page using jQuery may not work in the same set of browsers if its own code takes advantage of (or falls prey to) browser-specific behaviors. Testing is essential to fully support a browser. The modern.IE site makes available virtual machines for testing many different versions of Internet Explorer. Older versions of other browsers can be found at oldversion.com.
Only the most current version of jQuery is tested and updated to fix bugs or add features. Users of older versions that find a bug should upgrade to the latest released version to determine if the bug has already been fixed. The jQuery Migrate plugin may be helpful in identifying and fixing problems during a version upgrade.
About CSS Selector Compatibility
Regardless of a browser's support of CSS selectors, all selectors listed at api.jquery.com/category/selectors/ will return the correct set of elements when passed as an argument of the
CSS styles applied with jQuery's
.css() method are dependent on the browser's level of support. In general, jQuery does not attempt to overcome the limitations of a browser's style rendering. (One exception is
opacity, which jQuery "shims" for older Internet Explorer's alternative implementation.) Furthermore, prior to version 1.8, jQuery does not normalize vendor-prefixed properties.