jQuery 4.0.0 Release Candidate 1 | Official jQuery Blog

It’s here! Almost. jQuery 4.0.0-rc.1 is now available. It’s our way of saying, “we think this is ready; now poke it with many sticks”. If nothing is found that requires a second release candidate, jQuery 4.0.0 final will follow. Please try out this release and let us know if you encounter any issues. A 4.0 upgrade guide and jQuery Migrate release are also now available, but both are subject to changes before the final jQuery Core release. Many of the breaking changes in jQuery 4.0.0 are ones the team has wanted to make for years, but couldn’t in a patch or minor release. We’ve trimmed legacy code (including removing support for IE before version 11), removed some previously-deprecated APIs, removed some internal-only parameters to public functions that were never documented, and dropped support for some “magic” behaviors that were overly complicated. As usual, the release is available on our CDN and the npm package manager. Third party CDNs will not be hosting this rc release, but will host the 4.0.0 final release later. Here are some highlights for jQuery 4.0.0 rc.1.