WordPress.org

Andrew Ozz

Test jQuery Updates is an official plugin by the WordPress team that is intended for testing of jQuery and jQuery UI before updating them in WordPress. It is not intended for use in production.
Version 3.0 of the plugin is intended for testing of jQuery 4.0.0 beta in WordPress 6.5, 6.6, 6.7, and 6.8.
If you find a bug in a jQuery related script <a href="https://github.com/WordPress/wp-jquery-update-test/issues" rel="nofollow ugc">please report it</a>.
<h4>Default settings</h4>
When activated this plugin will replace the bundled version of jQuery with the version from this plugin. There are no other settings at this time. To stop testing please deactivate the plugin.

Test jQuery Updates

Marius L. J.

With the update to WordPress 5.5, a migration tool known as <code>jquery-migrate</code> was no longer enabled by default. This may lead to lacking functionality or unexpected behavior in some themes or plugins that run older code.
This plugin serves as a temporary solution, enabling the migration script for your site to give your plugin and theme authors some more time to update, and test, their code.
With the update to WordPress 5.6, the included version of jQuery is also upgraded. This means that old code that previously caused warnings now may instead may cause errors or stop working entirely.
Some of the features no longer working will just stop working behind the scenes without any apparent problem.
The plugin will let you downgrade to a previous version of jQuery for a period, but as a site administrator you are encouraged to get the underlying issue fixed.

Enable jQuery Migrate Helper

Also lets you know when it's no longer needed!!!!

This is what I call going above and beyond. I would rate 10 stars if I could. You deserve it.

Love it, super simple - perfect solution

Get information about calls to deprecated jQuery features in plugins or themes.

Test jQuery Updates vs Enable jQuery Migrate Helper