Traversing the DOM

function traverse(element) {
    function traverseElement(element, spacing) {
        console.log(spacing + element.nodeName);
        var len = element.childNodes.length;
        for (var i = 0; i < len; i ++) {
            var child = element.childNodes[i];
            if (child.nodeType === 1) {
                traverseElement(child, spacing + "--");
            }
        }
        console.log(spacing + "/" + element.nodeName);
    }
    traverseElement(element, "");
}