Wrap function (@mdjasper).

wrap.js

/*
Michael Jasper's (@mdjasper) wrap DOM element function.
From: http://www.mikedoesweb.com/2014/wrapping-an-element-in-vanilla-javascript/
*/
function wrap(top, selector, bottom){
  var matches = document.querySelectorAll(selector);
  for (var i = 0; i < matches.length; i++){
    var modified = top + matches[i].outerHTML + bottom;
    matches[i].outerHTML = modified;
  }
}
 
// Example usage: wrap("<div class='wrapper'>", ".getWrapped", "</div>");