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javascript for loop variable and recursion
function func(node) {
    for(var i = 0; i < node.children.length; i++) {
       func(node.children[i]);
    }
}

function func(node) {
    for(var i = 0, count = node.children.length; i < count; i++) {
        func(node.children[i]);
}

function walkTheDOM(node, func) {
    func(node);
    node = node.firstChild;
    while (node) {
        walkTheDOM(node, func);
        node = node.nextSibling;
    }
}

var root = document.getElementById('wrap');

walkTheDOM(root, function(node) {
    console.log( node.nodeName );
});

var span = document.getElementsByTagName("span")[0];
function func(node) {
    for(var i = 0; i < node.children.length; i++) {
       console.log([i, node]);
       func(node.children[i]);
    }
}
func(span);

// returns
// [0, <span id="hlinks-user">...</span>]
// [1, <span id="hlinks-user">...</span>]
// [2, <span id="hlinks-user">...</span>]
// [0, <a href="/users...">...</a>]
// [3, <span id="hlinks-user">...</span>]
// [0, <span title="1 silver...">...</span>]
// [1, <span title="1 silver...">...</span>]
// [4, <span id="hlinks-user">...</span>]
// [0, <span title="7 bronze...">...</span>]
// [1, <span title="7 bronze...">...</span>]
// [5, <span id="hlinks-user">...</span>]