This selector:

$(xml).find("routeStop:gt(0) load integer, routeStop:gt(0) unload integer").each(function(index){ });

Throws the following in IE7 (however it doesn't throw an error in IE8 running as IE7):

"Number expected"

... if (sortOrder) {
hasDuplicate = false; result.sort(sortOrder); <== error on this line

if (hasDuplicate){ ....

If you need more detail I can try to scrounge it up.

Error appears in FF 3.5

on query: "input:not(input[type=hidden]):not(input[type=image]):not(input[type=button]):not(input[type=reset]):not(input[type=submit]), textarea, select"

I can send document html on which I get that error (it's reproducible always on my side)

I've fixed it temporarily on my side by changing:

if (chunker.exec(match[3]).length > 1 || /^\w/.test(match[3]) ) {

into

var res = chunker.exec(match[3])
if ((res && res.length > 1) || /^\w/.test(match[3]) ) {

If an element has a classname such as "foo\nbar", it is not possible to query for it by the selectors ".foo" or ".bar".

The bug is rather obvious: the matching is done by checking " <classname> ", and not by other whitespace characters such as newline, tab etc.

Proposed fix: match by regexp instead, example: /\s<class_escaped>\s/.test(" " + element.className + " ")

Work-around: wrap every class in spaces in the class-attribute on the element.