P.S. Firefox 3.6.10 (Ubuntu Linux)

Are you able to provide your complete original test case for us to evaluate?

Sure, here it is. Replace "1.4.3" to "1.4.2" and see the difference when pressing submit:

http://jsfiddle.net/tebT7/

reduced test case

If you change name="id" to name="foo" this bug resolves itself. See: http://ejohn.org/blog/deadly-expandos/

Consider this a "well known gotcha". Note, this was addressed by myself and Rebecca Murphey

Fails in Firefox, and causes an Error to be raised in IE8. Works in Chrome, Opera, and Safari. Using common DOM words for input name or id attributes is inadvisable, but this should still work as it did in 1.4.2.

updated test case

#7270 is a duplicate of this ticket.

Make sure that we aren't reading one of the bad expandos. Fixes #7212.

Changeset: 4fc86d5eb1d4eaa3efad77dc224271d254f491e4

Documentation that this ticket is resolved in 1.4.4rc1

http://jsfiddle.net/rwaldron/tVXZj/

#7275 is a duplicate of this ticket.

#7324 is a duplicate of this ticket.

Replying to [comment:11 rwaldron]:

Documentation that this ticket is resolved in 1.4.4rc1 http://jsfiddle.net/rwaldron/tVXZj/

Firefox issue still persists.

This will work: console.log($("form").find("#id").length);

but this will not work: console.log($("#frm").find("#id").length);

<script type="text/javascript" language="javascript" src="http://code.jquery.com/jquery-1.4.4rc1.min.js" charset="utf-8"></script>
<script type="text/javascript">
$(function(){
	console.log($("form").find("#id").length);
	console.log($("form").find("[name=id]").length);
	console.log($("form").find(".cls").length);	
	console.log($("#frm").find("#id").length);
	console.log($("#frm").find("[name=id]").length);
	console.log($("#frm").find(".cls").length);
});
</script>
<form id="frm" name="frm">
    <input id="id" name="id" value="0" type="hidden" />
    <input class="cls" id="f1" name="f1" value="" type="text" />
</form>

Replying to [comment:14 cybernetix@…]:

Replying to [comment:11 rwaldron]: > Documentation that this ticket is resolved in 1.4.4rc1 > > > http://jsfiddle.net/rwaldron/tVXZj/ Firefox issue still persists. This will work: console.log($("form").find("#id").length); but this will not work: console.log($("#frm").find("#id").length);

> <script type="text/javascript" language="javascript" src="http://code.jquery.com/jquery-1.4.4rc1.min.js" charset="utf-8"></script>
> <script type="text/javascript">
> $(function(){
> 	console.log($("form").find("#id").length);
> 	console.log($("form").find("[name=id]").length);
> 	console.log($("form").find(".cls").length);	
> 	console.log($("#frm").find("#id").length);
> 	console.log($("#frm").find("[name=id]").length);
> 	console.log($("#frm").find(".cls").length);
> });
> </script>
> <form id="frm" name="frm">
>     <input id="id" name="id" value="0" type="hidden" />
>     <input class="cls" id="f1" name="f1" value="" type="text" />
> </form>
> 

Also this will not work:

	console.log($("[name=frm]").find("#id").length);
	console.log($("[name=frm]").find("[name=id]").length);
	console.log($("[name=frm]").find(".cls").length);

Please do not paste test code in tickets!

revised test case

Duplicate of #3113.

I that that back, it's the same phenomenon but not the same code/solution.

#7351 is a duplicate of this ticket.

I'm experiencing the same issue.

This is a very serious issue. Especially for those whom rely on jQuery for development and use google APIs (and setting the script to fetch the latest update).

#7356 is a duplicate of this ticket.

Only change ID on nodes that don't already have an ID for rooted qSA. Fixes #7212.

Changeset: 62c83a764cdb3f6e7f6a9b696de1636570df19bf

#7373 is a duplicate of this ticket.

#7384 is a duplicate of this ticket.

#7407 is a duplicate of this ticket.

Any word on a fix for this issue?

Replying to [comment:31 jeff@…]:

Any word on a fix for this issue?

This has already been fixed. You can see that by looking near the start of the page where it says

(closed bug: fixed)

Also check comment 27 where John set the ticket to fixed and provides a link.

#7460 is a duplicate of this ticket.

This change seems to cause strange behavior for invalid HTML where there is an id attribute with a space in it. This isn't a problem if the id is properly formatted and doesn't have a space.

If an element has a space in the ID (it was being auto-generated on our side and it wasn't supposed to have one...but it did) then the find() won't return a successful result on a subset of the children nodes. In our specific case, a parent TD node had an id="FIRST SECOND" (example) and then the children of that cell was a table with a row and 3 cells. Even though I wasn't using the id attribute in the traversing or selecting of any elements, trying to find() the first child cell of the TD with the invalid ID attribute would always return an empty result.

However, I could do a find() for the second and third cells and they would return the correct elements.

#7738 is a duplicate of this ticket.

#8507 is a duplicate of this ticket.

#3113 is a duplicate of this ticket.

I do not believe this bug has been fixed. It is possible that I am not understanding the definition of 'fixed'. This bug still exists in Firefox, including Firefox 4, but does not occur in Chrome.

http://jsfiddle.net/aero2600/xv3KB/1/

Replying to [comment:38 jcm@…]:

I do not believe this bug has been fixed. It is possible that I am not understanding the definition of 'fixed'. This bug still exists in Firefox, including Firefox 4, but does not occur in Chrome. http://jsfiddle.net/aero2600/xv3KB/1/

This bug has been fixed for 1.6, but this ticket is a duplicate of others currently open, such as #3113.

http://jsfiddle.net/timmywil/xv3KB/5/

Sorry, I meant #3685.

Replying to [comment:40 timmywil]:

Sorry, I meant #3685.

Thank you for the heads up.

I reached this bug report as I experienced odd jquery behavior resulting in returning broken element identifiers (selectors).

The bug was experienced on both Linux and Windows OS, respectively using browser FF 3.6.17 and FF 4.0.1

Jquery versions tested with are 1.4.2 and current 1.6.1 as of this comment.

Example of what I define as corruption/bug is available here: http://jsfiddle.net/98ZX9/

I tend to assume that the corruption I experienced is either related or as a result of the issue this bug report is referring to.