<!DOCTYPE html>
<html>
<head>
    <style>
        .container {
            height: 100px;
            width: 500px;
            margin: 4px;
            border: 1px solid black;
        }
        .box {
            position: relative;
            width: 100px;
            height: 100px;
            background-color: green;
        }
        
        /* For manual testing. */
        .container:hover .box {
            animation-play-state: running;
        }
        
        .mover {
            animation: move 1s linear -0.5s paused;
        }
        
        .slider {
            animation: slide 1s linear -0.5s paused;
        }
        
        @keyframes move {
            from { left: 0; }
            to   { left: 400px; }
        }

        @keyframes slide {
            from { transform: translate3d(0, 0, 0); }
            to   { transform: translate3d(400px, 0, 0); }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="mover box"></div>
    </div>
    <div class="container">
        <div class="slider box"></div>
    </div>
</body>
</html>