How well does jQuery support backward compatibility?

Question

We have had issues with Mootools not being very backward compatible specifically in the area of drag and drop functionality. I was wondering if anyone has had any similar pr

Answer 1

My experience is that when upgrading, I sometimes find that stuff that used to work breaks. For instance, when upgrading from 1.7.2 to 1.8.3 I found some drag-and-drop features stopped working. Some problems may be due to deprecated jQuery functions being dropped, still in use by incompatible versions of jQuery UI.

Here is a quote from another user:

Backward compatibility may not be the jQuery team’s strong suit, but as with most things, it’s a work in progress. I’m not meaning to disparage the great work they do, but it points out the fact that you simply must always test your scripts with new versions of jQuery.