var findElementPath = function ( elem ) {
    if(elem.parentNode == undefined) {
        return "";
    }
    var name = (elem.id || elem.className || elem.tagName),
        selector = (name == elem.id) ? elem.tagName+"#" : (name == elem.className) ? elem.tagName+"." : "";
        return (" " + (selector + name).toLowerCase() + " " + findElementPath(elem.parentNode));
}
findElementPath(document.getElementById("nana")).split(" ").reverse().join(" ");