WordPress 5.7: Big ol' jQuery Update
WordPress core code upgrades jQuery version from 1.12.4 to 3.5.1! This is significant because it brings many advantages, such as modern features, improved developer experience, and improved security. This update is currently planned for the release of WordPress 5.7 on March 9. ?
WordPress is known for its backward compatibility, and this change can be said to be a reflection of this philosophy. For jQuery, a boundary has been drawn, and version 1.x will no longer be a future plan. But this also represents a major change, which is relatively rare in the WordPress world. Because WordPress comes with jQuery, many developers use this version directly instead of reinstalling it elsewhere. This includes many themes and plugin developers who now need to make sure their code is compatible with jQuery 3.x.
Failure to do so can cause many websites to fail. But we still have over a month to deal with this, right?
This change has actually been going on for some time. This work began with WordPress 5.5, and version 5.7 is actually the third of three stages. In WordPress 5.6, the core team upgraded jQuery to version 3.5.1 and updated jQuery Migrate to help developers fall back to older versions of jQuery as needed. In other words, this is a very organized approach. The core team put a lot of effort into this, including all the communication about this change.
A few weeks ago, I wrote an article about this transition that included a guide to early testing and troubleshooting issues. It's for beginners, but you may find it useful as well. Make WordPress Support also has an exhaustive article about a plugin created specifically by the WordPress team for this transition. It's great: if a failure is detected, it can automatically roll back your website to jQuery 1.x. It also logs these failures and sends notifications in the event of a failure.
The key is to test it in WordPress 5.6 from now on. It is planned to disable jQuery Migrate in WordPress 5.7, so it's too late to wait until the release of this version. If you wait until then to find the problem, the best workaround might be to roll back to version 5.6 to take advantage of jQuery Migrate and helper plugins.
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