Get transition complete event name

transition-end-event-name.js

var transitionEventName

function getTransitionEndEventName() {
    if (transitionEventName !== undefined) {
        return transitionEventName
    }

    var detectedTransition,
        el = document.createElement('transitiondetector'),
        transitions = {
            'transition':       'transitionend',
            // see also http://ianlunn.co.uk/articles/opera-12-otransitionend-bugs-and-workarounds/
            'OTransition':      'oTransitionEnd',
            'MozTransition':    'transitionend',
            'webkitTransition': 'webkitTransitionEnd'
        }

    Object.keys(transitions).some(function (transition) {
        if (el.style[transition] !== undefined) {
            detectedTransition = transitions[transition]

            return true
        }

        return false
    })

    if (!detectedTransition) {
        detectedTransition = false
    }

    return (transitionEventName = detectedTransition)
}