var domtree = document.getElementById("top")

generateNode = function(dom) {
  var node = {
    tagname: dom.tagName || '',
    id: dom.id || '',
    classes: dom.classname || '',
    children: []
  };

  if ( dom.children.length > 0 ) {
    for ( var i = 0; i < dom.children.length; i++ ) {
      node.children.push(generateNode(dom.children[i]));
    }
  }

  return node;
}

var allNode = generateNode(domtree);

printNode = function(node) {
  var selectorString = node.tagname;
  if ( node.children.length > 0 ) {
    for ( var i = 0; i < node.children.length; i++ ) {
      selectorString += printNode(node.children[i]);
    }
  }
  return selectorString;
}

var pt = printNode(allNode);