DOM traversal techniques Element API

Walk in html dom with recursive function.

TraversDomTree(node){
        console.log(node);
      for(node=node.firstElementChild;node!=null;node=node.nextElementSibling){
        TraversDomTree(node);
       }    
 }           

To Implement,

     TraversDomTree(document.documentElement);
     OR
     TraversDomTree(div);
     OR
    TraversDomTree(ul);
    OR
    var node= Document.getElementById('idname');
    TraversDomTree(node);
    OR
    element = document.querySelector(selectors);  
    TraversDomTree(element);