The new method for setting $.boxModel & $.support.boxModel is:

jquery-1.7.2 - line 1455

jQuery.boxModel = support.boxModel = (document.compatMode === "CSS1Compat");

This returns false for ALL browsers when viewing a page without a doctype. That is incorrect as only IE browsers revert to the IE5 doctype in quirks-mode. So it seems the test should really be:

jQuery.boxModel = support.boxModel = (!jQuery.browser.msie || document.compatMode === "CSS1Compat");

The old method for testing boxModel (before 1.7.2) was to create a div with padding and then test its width. This was cumbersome but at least gave a correct result. The new test does not.

This is a serious bug as any code using $.support.boxModel to decide how to measure and size elements is now broken.

Hi there,

I've just updated jQuery to 1.8.0 from 1.7.2 in one of my projects and suddenly realized that fadeIn transition weren't working good.

Basically if the target class or ID does have a CSS3 transition property for opacity it just appear or disappear but does not fade.

In the previous version, the fadeIn, fadeOut just worked fine taking the animation from the one specified in the transition.

I've prepared two jFiddles:

1.8 version: ​http://jsfiddle.net/ALaguna/sW38M/1/ 1.7.2 version: ​http://jsfiddle.net/ALaguna/sW38M/2/

Here's a strange problem occuring in IE and not FF:

​http://www.amigrave.com/upload/posts/jquery/wheresthebeef.htm

When posted on the user's list, Yansky has put online a test case with firebug for IE:

​http://lazydragon.dreamhosters.com/test.html

The full discussion is here :

​http://groups.google.com/group/jquery-en/browse_thread/thread/d365293ce8df8791/c52743aafae98964#c52743aafae98964

Not sure it's a jQuery bug.