jQuery 3.7.0 Released: New Features, Performance Improvements, and Removal of Sizzle Selector Engine

jQuery 3.7.0 has been officially released. The update includes bug fixes, new methods, and performance improvements.

One notable change is the abandonment of the long‑used selector engine Sizzle—jQuery no longer depends on Sizzle as a separate project. The developers have moved Sizzle into jQuery itself, embedding its code directly into the core.

This is said to prepare for important selector changes in future jQuery versions. Although the impact is minor now, jQuery’s size is reduced by a few bytes, as Sizzle supported older browsers than jQuery.

In terms of operation performance, jQuery 3.7.0 delivers measurable improvements for certain use cases when using methods such as .append().

Developers note that removing test support for browsers that are no longer supported eliminates the need to run checks for document changes. In essence, this can yield anywhere from 0% to 100% speedup, with the most noticeable gains in rare scenarios where users frequently switch contexts between documents, possibly via operations across multiple iframes.

Other major changes

Added new method .uniqueSort()

Added several unitless CSS properties

Used different native focus events in IE

jQuery is a fast, small, and feature‑rich JavaScript library. Its easy‑to‑use API (compatible with many browsers) simplifies traversing and manipulating HTML documents, event handling, animation, and Ajax. Combining versatility and extensibility, jQuery has changed the way millions of developers write JavaScript.

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