Thanks for taking the time to contribute to the jQuery project by writing a bug report but we can't take any further action on this ticket for the following reasons:

• no clear description of what the bug is was given
• link to test case contains several tests
• test uses awfully old jQuery version (1.2.3!!!)
• includes a jQuery plugin (which wasn't updated since 2008!!!)

Please also note that the jQuery bug tracker is only for jQuery core issues not for bugs in some jQuery plugin (report these to the author). You can also use the jQuery Forum for support requests regarding some specific jQuery plugin.

So unless you can provide better description of the issue and a valid, reduced test case (ideally on http://jsfiddle.net), which reproduces the bug with the latest jQuery version and has not other dependencies (not using a plugin), we can't investigate this bug further.

Please report back if you can provide the requested information and we will be more then happy to reopen the issue.

The version(s) of jQuery affected:

1.4.2+

The browser (or browsers) that you are able to reproduce the bug in, including version numbers:

Internet Explorer 8.0.x, 7.x

The operating system (or operating systems) you experienced the bug on:

Only Windows 7

Step-by-step instructions on how to reproduce the issue, including any required system configuration changes:

Using IE under W7

Declare HTML code

Use fadeIn or fadeOut to animate any element of the DOM.

A description of what you expect to happen, and what actually happens:

The animated element fades in (or out) smoothly. Instead the element (it is better to use text to see the bug) seems to "move" like if the font were becomming thinner and/or bolder.

A link to a reduced, working demo/test case that will never move (jsFiddle is good for this:

http://jsfiddle.net/4LTuW/6/

Information on other browsers where the issue does not occur:

FireFox, GoogleCrome,Safari, Internet Explorer under Windows XP.

Can someone with Win7 check this out?

Thanks for the report, but this is not a jQuery bug. IE in Windows 7 composites the faded text differently from other Windows OS, but it does exactly the same thing in other versions of Windows. If you want to not experience this issue, don’t use a transparent background colour on the element you are fading.