Drawing animated arc with pure CSS

Question

I know it is possible to draw and animate arcs in svg and canvas. However, is it possible in css?

I have created an arc using the following method:

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Answer 1

I may be a little late, but I think using two "hiders" and translating one up and one down will look a little better.

Working Example

    



body {
    background:orange;
}
.wrap {
    position:absolute;
    height:400px;
    width:170px;
    overflow: hidden;
}
.arc {
    position:absolute;
    width:150px;
    height:400px;
    margin:10px;
    border-radius:50%;
    border-right:1px solid black;
    border-left:1px solid black;
    border-top:1px solid black;
    border-bottom:1px solid transparent;
}
.arc:before {
    content:"";
    position:absolute;
    left:-1px;
    top:-2px;
    background: orange;
    width:76px;
    height:375px;
    animation:unhide1 5s linear both;
}
.arc:after {
    content:"";
    position:absolute;
    left:75px;
    top:-2px;
    background: orange;
    float: right;
    width:76px;
    height:375px;
    animation: unhide2 5s linear 5s both;
}
@keyframes unhide1 {
    100% {
        transform: translatey(-375px);
    }
}
@keyframes unhide2 {
    100% {
        transform: translatey(375px);
    }
}