function appendHtml(el, str) {
  var div = document.createElement('div');
  div.innerHTML = str;
  while (div.children.length > 0) {
    el.appendChild(div.children[0]);
  }
}
var html = '
Some Title
Some arbitrary text';
appendHtml(document.body, html); // "body" has two more children - h1 and span.