jQuery: The Write Less, Do More, JavaScript Library

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jQuery 4.0.0 has been released after 20 years since the library's introduction and nearly 10 years since the last major version. This release drops support for IE 10 and older browsers, migrates the source from AMD to ES modules, adds Trusted Types and CSP support, removes deprecated APIs (like jQuery.trim, jQuery.parseJSON), and updates the focus event order to match the W3C spec. The slim build is now smaller (19.5k gzipped) with Deferreds and Callbacks removed. Breaking changes include removal of internal-only methods from the jQuery prototype and elimination of some legacy behaviors, though most users should be able to upgrade with minimal code changes using the provided migration guide and plugin.

Official jQuery Blog