jQuery 4 removes support for Internet Explorer <11, Edge Legacy (non-Chromium), iOS <11, and Firefox <65, enabling removal of legacy workarounds and polyfills. The gzipped distribution is roughly 3KB smaller than 3.7.1 after removing the Sizzle selector engine and IE-specific hooks. The source migrates from AMD/RequireJS to ES Modules (ESM) while retaining a UMD build, improving compatibility with Rollup, Webpack, and Vite. AJAX changes disable automatic promotion of dataType:'json' to JSONP, requiring explicit dataType:'jsonp' to prevent unintended remote code execution. The release emphasizes modernization, smaller footprint, better bundler integration, and tighter AJAX security.
"jQuery 3.x: Supports Internet Explorer 9+, Edge Legacy, iOS 7+, and Firefox 45+. jQuery 4: Removes support for IE < 11, Edge Legacy (non-Chromium), iOS < 11, and Firefox < 65. Impact: The gzipped file size of jQuery 4 is approximately 3KB smaller than 3.7.1. The removal of the Sizzle selector engine (in favor of a native-first approach) and IE-specific hooks contributes to this reduction."
"jQuery 3.x: The source code relies on AMD (Asynchronous Module Definition) and RequireJS. This structure makes it difficult to import specific parts of the source directly into modern bundlers without a build step. jQuery 4: The source code is migrated to ES Modules (ESM). While the distributed file remains a UMD module for compatibility, the source is now compatible with Rollup, Webpack, and Vite. This allows for better integration into modern development workflows."
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