code: function getCubicBezierTransition (x1, y1, x2, y2) {
        return function (pos) {
          return cubicBezierAtTime(pos,x1,y1,x2,y2,1);
        };
      }
docs: /*!
  getCubicBezierTransition(x1, y1, x2, y2) -> Function
  
  Generates a transition easing function that is compatible
  with WebKit's CSS transitions `-webkit-transition-timing-function`
  CSS property.
  
  The W3C has more information about
  <a href="http://www.w3.org/TR/css3-transitions/#transition-timing-function_tag">
  CSS3 transition timing functions</a>.
  
  @param {number} x1
  @param {number} y1
  @param {number} x2
  @param {number} y2
  @return {function}