jQuery 4 is finally in beta after 8 years of hard work. It includes bug fixes, performance improvements, and some breaking changes. Support for Internet Explorer less than 11 has been removed, but jQuery is still being careful with how this breaks things. Other browser support, such as Edge Legacy and older versions of iOS and Android browsers, has also been dropped. Deprecated APIs have been removed and the source has been migrated to ES modules. Trusted types in CSP and form data support in jQuery Ajax are some of the other notable improvements.
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