code: function unwrapElements(parent, wrapper) {
    var el = wrapper.childNodes[0];
  
    // ok, so this looks weird, right?
    // turns out, appending nodes to another node will remove them
    // from the live NodeList, so we can keep iterating over the
    // first item in that list and grab all of them. Nice!
    while (el) {
      parent.appendChild(el);
      el = wrapper.childNodes[0];
    }
  
    parent.removeChild(wrapper);
  }
docs: unwrap elements from another element
  @param {Element} parent
  @param {Element} wrapper