What’s New in jQuery 4.0.0 RC1? Key Changes and Slim Build Overview
jQuery 4.0.0 Release Candidate 1 introduces major updates such as dropping legacy browser support, removing deprecated APIs, adding a slim build without AJAX and animation, and improving event handling and modern browser compatibility, inviting developers to test before the final release.
jQuery 4.0.0 RC1 has been released, and the team believes it is near final, inviting extensive testing. If no critical issues are found, the final version will be launched.
Main changes and highlights
Removed legacy browser support : No longer supports IE < 11, Edge Legacy, iOS < 11, Firefox < 65, and old Android browsers.
Trimmed legacy code and deprecated APIs :
Removed many deprecated APIs such as jQuery.isArray, jQuery.parseJSON, jQuery.trim, jQuery.isFunction, etc.
Removed Array methods from the jQuery prototype ( push, sort, splice), recommending standard array methods instead.
Introduced “slim” build : A smaller version without AJAX and animation modules, reducing gzip size by about 8 KB.
Other improvements :
Fixed and simplified event handling (e.g., focusin and focusout order).
Improved compatibility with modern browsers, reduced “magic” behavior, and enhanced performance and maintainability.
For full details, see the official blog post.
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