Q:

Hoverintent working in jquery1.8.3 but not in 1.9.0? 

I was working with the accordion from the jquery-ui website, but even the simple demo wasn't working for me.  I traced the error to the hoverintent not being supported with jquery-1.9.1.js but works in 1.8.3.js.  
You can copy the script (view source) available here, http://jqueryui.com/accordion/#hoverintent.  Change it to this, 
 <script src="http://code.jquery.com/jquery-1.9.1.js"></script>

and it will stop working. 
Any suggestions on how I should fix it?  All the other part of my code are compatible with jquery-1.9.1.js. 

A:

When testing code in jQuery 1.9.x please also use migrate-js. 
A lot of deprecated features have been removed in 1.9.x and the migrate-js contains the removed features and shows you what they are through console messages. 
In your case it is as per migrate-js message, it seems that hoverintent is using a removed feature:
JQMIGRATE: jQuery.event.handle is undocumented and deprecated

Adding the migrate-js file reference in addition to 1.9.x makes it work again. 
However, as mentioned by Kevin B in the comment on the original post, the code is an example so you either need to upgrade the code yourself or keep the migrate-js file reference in your application, which is not recommended as a permanent solution though. 

DEMO - Using 1.9.1 + migrate-js for Hoverintent

Useful Resources for 1.9.x

jQuery 1.9.1 Release Notes
jQuery Migrate 1.1.0 Released
jQuery 1.9 RC1 and Migrate RC1 Released

There is more on their blog which are a very good read

