createDocumentFragmentFromString.js

/*
 *  Generate document fragment from HTML string
 *  @param { HTML string } str
 *
 *  Example: 
 *  -> document.createDocumentFragmentFromString('<b>sup</b>&nbsp;');
 *  <- #document-fragment
 */
 
document.createDocumentFragmentFromString = function (str) {
  var container = document.createElement('div')
    , fragment  = document.createDocumentFragment();
  container.innerHTML = str;
  var i; while ( i = container.firstChild ) fragment.appendChild(i);
  return fragment;
}