xfrm-helper.js

var xfrm = function(el, xlatX, xlatY, scale, rot) {
  xlatX = typeof xlatX === 'undefined' ? 0 : xlatX;
  xlatY = typeof xlatY === 'undefined' ? 0 : xlatY;
  scale = typeof scale === 'undefined' ? 1 : scale;
  rot   = typeof rot === 'undefined' ? 0 : rot;
  var xfrm =
    'translate3d(' + xlatX + 'px, ' + xlatY + 'px, 0px) ' +
    'scale3d(' + scale + ', ' + scale + ', 1) ' +
    'rotate(' + rot + 'deg)';
  el.style.mozTransform =
  el.style.msTransform =
  el.style.webkitTransform =
  el.style.transform = xfrm;
};