[Documentation request] Transition guide towards jquery 4.0.0

[rubyFeedback]

The sSecond Beta of jQuery 4.0.0 has been released about a year ago or so.

I have not followed jquery that much in the last 3 years or so and could need a refresher.

I think many more jquery users probably could need a refresher too.

When jquery 4.0.0 is finally stable or out of beta, could a tutorial or document be added
that explains, with examples, some of the larger changes? This does not have to be a
very long tutorial; just something that keeps people "up to date" with what has changed,
ideally also with examples. Jquery always had good examples, so this would be very
helpful for people transitioning to jquery 4.x. I'd be happy to transition too, but due to
inertia it seems easier to stay on jquery 3.x until I have enough knowledge of what has
to change in order to transition into jquery 4.x successfully. Thanks!

[mgol]

Hi, thanks for your interest in jQuery!

We're currently in finishing stages of preparing for 4.0.0-rc.1. That release will include a blog post explaining changes and an upgrade guide that will appear at https://jquery.com/upgrade-guide/; there's an in progress version at jquery/jquery.com#250 that's almost ready.

There are some examples in the upgrade guide, but not a ton - we are not adding lots of new APIs to jQuery at this time. Feel free to read the proposed upgrade guide and leave feedback!