There was recently a question (the first of its kind) asked about the little-known :nth() selector, used in the sizzle.js engine, which I answered.

Link to said question here - http://stackoverflow.com/questions/17382703/what-is-the-nth-pseudo-class-selector-in-jquery.

As you'll see in my answer, I included an old mailing list conversation regarding the difference between the two, and when both selectors were pointed out to be equal, John Resig responded: "Huh... I should probably nuke :nth().".

Link to said mailing list conversation here - http://www.mail-archive.com/jquery-en@googlegroups.com/msg13567.html.

I'm a little confused as to why :nth() has still not been removed considering it is seemingly exactly the same as :eq(). Are there any plans to remove it in the future? If not, why?

Side query: It appears a jsPerf was made to compare and confirm the two selectors were exactly the same; all's well when tested in desktop browsers, however there seems to be differences in speed in mobile browsers - surely those tests just anomalies? or is there anything behind it?

Link to said jsPerf - http://jsperf.com/eq-vs-nth