function TweenExtra() {
      var args = [], len = arguments.length;
      while ( len-- ) args[ len ] = arguments[ len ];

      Tween.apply(this, args); // import constructor of TweenBase -> Tween

      return this;
    }
The `KUTE.TweenExtra()` constructor creates a new `Tween` object
for a single `HTMLElement` and returns it.

This constructor is intended for experiments or testing of new features.