The selector $('foo:eq(-1)') returns the last foo, but the documentation claims this should result in an empty set.

Fiddle demonstrating behavior: http://jsfiddle.net/Gj5Qj/3/

Documentation: http://api.jquery.com/eq-selector/

Specific documentation text: "Unlike the .eq(index) method, the :eq(index) selector does not accept a negative value for index. For example, while $('li').eq(-1) selects the last li element, $('li:eq(-1)') selects nothing."

Able to reproduce in both Chrome (v19) and Firefox (v11) on Linux.