Firefox 和 IE 中的 CSS 动画支持？

Question

当用户将鼠标悬停在导航栏上时，我的导航栏上有 CSS 动画。

问题是它们都只能在 Chrome 中工作。 它们都有正确的扩展名但什么也没发生？

一个按钮的例子：

#WhatsWhatButton:hover
{
-webkit-animation-name: sway;
-webkit-animation-duration: 1.5s;
-webkit-animation-fill-mode: both;
-moz-animation-name: sway;
-moz-animation-duration: 1.5s;
-moz-animation-fill-mode: both;
-ms-animation-name: sway;
-ms-animation-duration: 1.5s;
-ms-animation-fill-mode: both;
-o-animation-name: sway;
-o-animation-duration: 1.5s;
-o-animation-fill-mode: both;
animation-name: sway;
animation-duration: 1s;
animation-fill-mode: both;
} 

@-webkit-keyframes sway
{
0% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
15% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
30% {background:url('Images/Icons/WhatsWhatIcon3.png'); background-position: center bottom;background-size: 225px 100px;}
45% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
60% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
75% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
90% {background:url('Images/Icons/WhatsWhatIcon5.png'); background-position: center bottom;background-size: 225px 100px;}
100% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
}

@-moz-keyframes sway
{
0% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
15% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
30% {background:url('Images/Icons/WhatsWhatIcon3.png'); background-position: center bottom;background-size: 225px 100px;}
45% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
60% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
75% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
90% {background:url('Images/Icons/WhatsWhatIcon5.png'); background-position: center bottom;background-size: 225px 100px;}
100% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
}

@-ms-keyframes sway
{
0% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
15% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
30% {background:url('Images/Icons/WhatsWhatIcon3.png'); background-position: center bottom;background-size: 225px 100px;}
45% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
60% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
75% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
90% {background:url('Images/Icons/WhatsWhatIcon5.png'); background-position: center bottom;background-size: 225px 100px;}
100% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
}

@-o-keyframes sway
{
0% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
15% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
30% {background:url('Images/Icons/WhatsWhatIcon3.png'); background-position: center bottom;background-size: 225px 100px;}
45% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
60% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
75% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
90% {background:url('Images/Icons/WhatsWhatIcon5.png'); background-position: center bottom;background-size: 225px 100px;}
100% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
}

@keyframes sway
{
0% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
15% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
30% {background:url('Images/Icons/WhatsWhatIcon3.png'); background-position: center bottom;background-size: 225px 100px;}
45% {background:url('Images/Icons/WhatsWhatIcon2.png'); background-position: center bottom;background-size: 225px 100px;}
60% {background:url('Images/Icons/WhatsWhatIcon.png'); background-position: center bottom;background-size: 225px 100px;}
75% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
90% {background:url('Images/Icons/WhatsWhatIcon5.png'); background-position: center bottom;background-size: 225px 100px;}
100% {background:url('Images/Icons/WhatsWhatIcon4.png'); background-position: center bottom;background-size: 225px 100px;}
}

如您所见，所有关键帧都有其扩展名，并且是从#WhatsWhatsButton:hover 内部启动的

但它仍然不能在 IE 或 Firefox 中设置动画。

为了记录，我正在运行最新的 Firefox (V22.0) 和 IE 10

Answer 1

Firefox 和 IE10 都支持 CSS 动画（现在甚至没有前缀，所以没有必要为动画使用 -ms- 前缀，因为没有发布的 IE 版本需要它们，而且 -moz- 可能也可以安全删除因为 Firefox 从 16 版开始就不需要前缀了）。但是“背景图像”属性在规范中被标记为“不可动画”。这就是为什么大多数浏览器无法通过 CSS 为它们设置动画（交叉淡入淡出），只有 Chrome 具有这种非标准功能。有关该主题的更多信息：CSS3 transition of background-image for Firefox not working

作为一种解决方法，我建议创建 2 层背景（例如元素和伪元素）并为顶层的不透明度设置动画。