fb2edit/source/js/get_location.js

var startNode = document.getSelection().anchorNode;
// create a reverse function for jQuery
$.fn.reverse = [].reverse; 
var hierarchy = $( startNode ).parents().reverse().add( $( startNode ) ) ;
hierarchy.map(function () { 
    if ( undefined !== $( this ).parent().get( 0 ).tagName )
	{
        var first_part = $( this ).parent().get( 0 ).tagName + "=";
        return first_part + $( this ).parent().children().index( this );
    }
}).get().join(",");