Appendix A. Help and Support

Throughout this book, you will have noticed that we’ve concentrated on using jQuery Version 2.0 as the most recent version available for use with jQuery UI. However, jQuery UI 1.10 comes bundled with jQuery 1.9.1 by default—why should we use Version 2.0, if Version 1.9.1 is bundled with jQuery UI 1.10?

The reason for this is simple, and relates to an important change made with Version 2.0, where support for Internet Explorer (IE) 6-8 has been removed. Removing support for these older browsers has allowed the jQuery team to remove significant parts of the library, as these were only included to provide workarounds for browsers!

While there has been a big push to retire IE 6 because of the security vulnerabilities, there is still an element of need to support it; with this in mind, the jQuery team are still producing and supporting versions of jQuery under the 1.x branch, for as long as these older browsers are still used.