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;
}());
