Why doesn't this CSS animation work on IE?

Question

I implemented this nice little css-based loader I found and then realized it doesn't work on IE (I tried IE11). I thought maybe it needed the vendor specific prefixes, so I tried using an online autoprefixer using 'last 2 versions' as the filter and it adds '-webkit-' prefixes but not the '-ms-' which makes me wonder if there something wrong with the way the css code is written that makes the '-ms-' prefixes not show up. I tried manually replacing the '-webkit-' with '-ms-' but it still doesn't work on IE.

What is preventing this from working on IE? Does the vendor prefixing have anything to do with it or not?

I haven't tried on any browser other than Chrome and IE at this point but would like to make it work on all major browsers last 2 versions if that is reasonable.

Original CSS - works great on Chrome but not on IE:

.page-loader{ background: #f9f9f9 none repeat scroll 0 0;
    height: 100%;
    left: 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 9998;}
.loader {
    height: 8px;
    margin: 0 auto;
    position: relative;
    text-align: center;
    top: 50%;
    width: 44px;
}
.dot {
    background: #ccc none repeat scroll 0 0;
    border-radius: 50%;
    display: inline-block;
    height: 10px;
    position: absolute;
    width: 10px;
}
.dot_1 {
    animation: 1.5s linear 0s normal none infinite running animateDot1;
    background: #f26f29 none repeat scroll 0 0;
    left: 12px;
}.dot_2 {
    animation: 1.5s linear 0.5s normal none infinite running animateDot2;
    left: 24px;
}.dot_3 {
    animation: 1.5s linear 0s normal none infinite running animateDot3;
    left: 12px;
}.dot_4 {
    animation: 1.5s linear 0.5s normal none infinite running animateDot4;
    left: 24px;
}
 @keyframes animateDot1 {
0% {
    transform: rotate(0deg) translateX(-12px);
}
25% {
    transform: rotate(180deg) translateX(-12px);
}
75% {
    transform: rotate(180deg) translateX(-12px);
}
100% {
    transform: rotate(360deg) translateX(-12px);
}
}
@keyframes animateDot2 {
0% {
    transform: rotate(0deg) translateX(-12px);
}
25% {
    transform: rotate(-180deg) translateX(-12px);
}
75% {
    transform: rotate(-180deg) translateX(-12px);
}
100% {
    transform: rotate(-360deg) translateX(-12px);
}
}
@keyframes animateDot3 {
0% {
    transform: rotate(0deg) translateX(12px);
}
25% {
    transform: rotate(180deg) translateX(12px);
}
75% {
    transform: rotate(180deg) translateX(12px);
}
100% {
    transform: rotate(360deg) translateX(12px);
}
}
@keyframes animateDot4 {
0% {
    transform: rotate(0deg) translateX(12px);
}
25% {
    transform: rotate(-180deg) translateX(12px);
}
75% {
    transform: rotate(-180deg) translateX(12px);
}
100% {
    transform: rotate(-360deg) translateX(12px);
}
}

Answer 1

Perhaps try removing the running values from your animation properties. This makes the animation work for me in IE11.

I see that there's some discussion of this issue here:
" CSS3 animation is not working in IE11 but works in other browsers "