gistfile1.js

;(function () {
  var Modernizr

  // run cb when the next animation is complate (or right away if there is no animation support)
  var cssTransitionEnd = function (cb) {
    var $self = $(this)
    var transEndEventNames = {
      'WebkitTransition' : 'webkitTransitionEnd',
      'MozTransition'    : 'transitionend',
      'OTransition'      : 'oTransitionEnd',
      'msTransition'     : 'msTransitionEnd', // maybe?
      'transition'       : 'transitionEnd'
    }

    var transEndEventName = transEndEventNames[Modernizr.prefixed("transition")]

    function unbind () {
      $self.off(transEndEventName, animEnd)
    }

    // animations propogate so only cb if it was fired on this elem
    function animEnd (e) {
      if (e.target == e.currentTarget) {
        if (cb(e.originalEvent.propertyName) !== false) unbind()
      }
    }

    if (Modernizr.csstransitions) {
      $self.on(transEndEventName, animEnd)
    }
    else {
      // just run the cb now because the event will never be fired
      setTimeout(function () {
        cb("")
      }, 0)
    }

    return {
      unbind: unbind
    }
  }

  if (typeof define !== 'undefined' && define.amd) {
    // AMD
    define(['jquery', 'modernizr'], function ($, ModernizrDep) {
      Modernizr = ModernizrDep
      $.fn.cssTransitionEnd = cssTransitionEnd
      return $
    })
  }
  else {
    $.fn.cssTransitionEnd = cssTransitionEnd // old skool browser
  }
}())