[devote]

можно еще так проверить:

eventNames = (function(){
    var conf ={ animationend: 'webkitanimationend' },
        div = document.createElement('div');

    div.addEvenetListener( 'animationend', function(){
        conf.animationend = 'animationend';
    }, false );

    var o = document.createEvent( 'Events' );
    o.initEvent( 'animationend', false, false );
    div.dispatchEvent( o );

    div = null;
    return conf;
}());