jQuery 4.0 Released

jQuery 4.0 Released

jQuery 4.0 is now available. This is the first major release in years and focuses on modern browser support, a smaller core, and cleaner APIs.

What’s New

  • Internet Explorer support is fully removed.
  • Deprecated APIs and legacy workarounds are gone.
  • Core utilities are lighter and faster on modern engines.
  • Error handling is stricter to expose hidden bugs earlier.
  • Better alignment with modern build tools and modules.

Upgrade Notes

Most jQuery 3.x code continues to work. Projects with legacy browser dependencies must refactor before upgrading. Using the jQuery Migrate plugin is recommended during testing.

Why It Matters

jQuery 4.0 shifts priority from backward compatibility to long-term maintainability. It keeps jQuery relevant for existing codebases while matching current web standards.

source: https://blog.jquery.com/