jQuery API Documentation

Category: Version 4.0

This is a pre-release. Behavior may change before 4.0.0 final is released.

Aspects of the API that were changed in the corresponding version of jQuery.

Dropped support for IE <11 & Edge Legacy, removed deprecated APIs, added FormData support, improved support for CSP & Trusted Types. Automatic JSONP promotion removed. Special handling of boolean attributes removed.

Callbacks & Deferred modules are now excluded from the Slim build.

jQuery is now authored in ESM.

For more information, see the Release Notes/Changelog of jQuery 4.0.0-beta.2.

Also in: Attributes | Manipulation > General Attributes

.attr()

Get the value of an attribute for the first element in the set of matched elements or set one or more attributes for every matched element.

Also in: CSS | Manipulation > Style Properties

.css()

Get the value of a computed style property for the first element in the set of matched elements or set one or more CSS properties for every matched element.