keyframe test canidate

gistfile1.txt

var D = document,
  Db = D.body;
  function De(x) { return D.createElement(x); }
  function Dt(x) { return D.createTextNode(x); }
  function Da(x) { return Db.appendChild(x); }
  function Dr(x) { return Db.removeChild(x); }
  function Dg(x) { return document.getElementById(x); }
  var s = De('style'),
  ss = s.styleSheet,
  vendors = ['-moz-','-ms-','-webkit-', ''],
  rules = [];
  for (var i = vendors.length - 1; i > -1; i--) {
    rules.push(Dt('@'+ vendors[i] + 'keyframes Qz {0%, 100% {margin-left: 500px}}'));
  }
  rules.push(Dt('#testingDiv {-webkit-animation: 1s Qz infinite 0s;-moz-animation: 1s Qz infinite 0s;-ms-animation: 1s Qz infinite 0s;animation: 1s Qz infinite 0s; }'));
  if(ss) {
    var ssc = ss.cssText;
    for (var i = rules.length - 1; i > -1; i--) {
      ssc += rules[i].nodeValue;
    }
  }
  else {
    for (var i = rules.length - 1; i > -1; i--) {
      s.appendChild(rules[i]);
    }
  }
  s.setAttribute('id','keyframe_test');
  Da(s);
  var testingDiv = De('div');
  testingDiv.setAttribute('styleA','height: 1px;width: 1px;background: transparent;margin: 0px; padding: 0; position: absolute; z-index: -100');
  testingDiv.setAttribute('id','testingDiv');
  Da(testingDiv);
  if (Dg('testingDiv').offsetLeft >= 500) {
    Db.classList = Db.className += 'keyframes';
  }
  Dr(Dg('testingDiv'));
  Dr(Dg('keyframe_test'));