Equivalent in JavaScript to .closest() from jQuery (MS and modern browsers)

closest-javascript.js

// Source: https://stackoverflow.com/q/18663941/137626 (answers #1 Ales and #2 Joon)
function sgClosest(el, selector) {
  var matchesFn;

  // find vendor prefix (@NOTE-phv Limited to MS here, other prefixes are ditched)
  ['matches', 'msMatchesSelector'].some( function (fn) {
    if (typeof document.body[fn] == 'function') {
      matchesFn = fn;
      return true;
    }
    return false;
  });

  var parent;

  // traverse parents
  while (el) {
    parent = el.parentElement;
    if (parent && parent[matchesFn](selector)) {
      return parent;
    }
    el = parent;
  }

  return null;
}