If to jQuery#before passed function argument it should receive index of the current element in the set

[markel]

But it does not – ​http://jsfiddle.net/sHqu9/

From doc –

.before( function ) A function that returns an HTML string, DOM element(s), or jQuery object to insert before each element in the set of matched elements. Receives the index position of the element in the set as an argument. Within the function, this refers to the current element in the set.

[markel]

Pull request – ​https://github.com/jquery/jquery/pull/1093

[dmethvin]

Landed at ​https://github.com/jquery/jquery/commit/5afc93c436020f8ceabe8cab449f1c0030ba6ecd