All of our websites include jQuery - originally because our own JavaScript that we bundle with every site requires it, but we know that our customers add code to their websites which use it too.
The version we've included, the most recent release of v1, is now quite old and has long been surpassed by v2 (now defunct) and currently v3.
Each major version can include changes which are not just improvements or new features, but also the removal of features, or changes to existing ones that could impact on your code if it relies on jQuery.
Switching all of our websites to use v3, even with a fair notice period, would be difficult to handle and support, so instead we're introducing the option for you to switch, if and when you would like to.
Customers who join us from today will use v3 by default.
You'll find the option to switch to v3 in: > Site Settings (you'll need access to this section first) > Head and Body HTML > jQuery version
Should I switch our website to v3?
We're not able to make the decision for you, because we don't know whether you have used jQuery in your web content, or included any scripts or plug-ins in your website which use it.
Upgrading is worth considering though as jQuery v3 includes security fixes, performance improvements, and reduced file size by changing the supported browser versions, dropping IE 6–8. The jQuery upgrade guide walks you through the changes.
