Simple CSS3 animation is not working in Firefox

Question

I am trying to Animate a div. What i am actually doing in the animation is translating the div to 100%. but the animation only works in chrome and it is not working in Firefox. i tried to add prefix and i also included prefix-free.js plugin. Caniuse.com says firefox will support animations without prefixing. I have seen lot similar question in stack over flow. but most of them are using property's that are not yet supported in Firefox and other. But mine is very simple. I even tried by removing translation and background-color change. but it is also not working.

HTML:

<div class="container">
    <div class="icon"></div>
</div>
<script src='//cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js' ></script>

CSS:

.container {
    padding:3em;
}
.icon {
    width: 100px;
    height: 100px;
    background-color: red;
    animation: test 1s linear 0 infinite normal both;
}
@keyframes test {
    0% {
        transform: translateX(50%);
        background-color: red;
    }
    100% {
        transform: translateX(0%);
        background-color: yellowgreen;
    }
}

Demo

Answer 1

Your syntax is invalid. Your zero animation-delay needs to have a unit, so it should be 0s, not 0:

.icon {
    width: 100px;
    height: 100px;
    background-color: red;
    animation: test 1s linear 0s infinite normal both;
}

Unitless zeroes are only permitted for lengths, not times. See this answer for an explanation (the question is about transitions, but it applies to animations as well).