IE9中的@keyframes规则

我的 @keyframes 的动画在IE中不起作用。在网上各种消息来源说IE9支持它，有些人说它不受支持。是否有人确切知道我应该停止朝这个方向努力......如果没有，那么什么是 @ - ms-keyframes 我认为它是IE的前缀...谢谢！

My animation with @keyframes is not working in IE. On the net various sources say that it is supported in IE9 and some say that it is not supported. Does somebody know for sure so that I should stop working in that direction… And, if not, what is @-ms-keyframes I thought it is a prefix for IE… Thanks!

@-webkit-keyframes move {
  0% {left: 0px;}
  49% {left: 940px; opacity: 1;}
  50% {left: 940px; opacity: 0;}
  51% {left: -940px; opacity: 0;}
  52% {left: -940px; opacity: 1;}
  100% {left: 0px;}
}

@-webkit-keyframes backup {
  0% {left: -940px;}
  100% {left: 940px;}  

}  

@-moz-keyframes move {
  0% {left: 0px;}
  49% {left: 940px; opacity: 1;}
  50% {left: 940px; opacity: 0;}
  51% {left: -940px; opacity: 0;}
  52% {left: -940px; opacity: 1;}
  100% {left: 0px;}
}

@-moz-keyframes backup {
  0% {left: -940px;}
  100% {left: 940px;}  

}  

@-ms-keyframes move {
  0% {left: 0px;}
  49% {left: 940px; opacity: 1;}
  50% {left: 940px; opacity: 0;}
  51% {left: -940px; opacity: 0;}
  52% {left: -940px; opacity: 1;}
  100% {left: 0px;}
}

@-ms-keyframes backup {
  0% {left: -940px;}
  100% {left: 940px;}  

}