css-animation support detecting

if(window.AnimationEvent || 'onanimationend' in document.body || document.body.onanimationend === null){
//oh yeah..
}else if(window.VendorAnimationEvent){
// oh.. not so bad
}else {
//fuck, no..
}

var animation = false,  
    animationstring = 'animation',  
    keyframeprefix = '',  
    domPrefixes = 'Webkit Moz O ms Khtml'.split(' '),  
    pfx  = '';  
  
if( elm.style.animationName ) { animation = true; }      
  
if( animation === false ) {  
  for( var i = 0; i < domPrefixes.length; i++ ) {  
    if( elm.style[ domPrefixes[i] + 'AnimationName' ] !== undefined ) {  
      pfx = domPrefixes[ i ];  
      animationstring = pfx + 'Animation';  
      keyframeprefix = '-' + pfx.toLowerCase() + '-';  
      animation = true;  
      break;  
    }  
  }  
}

element[pfx.toLowerCase() + 'animationend'] = function(){...}