Arrow SMIL/CSS Animation II

<!DOCTYPE html>
<meta charset="UTF-8">
<style>
    svg {
        border: 1px solid #ccc;
        display: block;
        margin: 8px 0;
    }

div {
        float: left;
        margin: 8px;
        width: 216px;
        font-family: sans-serif;
    }

body {
        padding: 16px;
    }
</style>
<body>
<div>
    <strong>Static SVG</strong>
    <svg width="64" height="64">
        <defs>
            <marker id="arrow-1"
                    orient="auto"
                    viewBox="0 0 8 8"
                    markerWidth="8"
                    markerHeight="8"
                    markerUnits="strokeWidth"
                    refX="0"
                    refY="4"
                    fill="#000">
                <polyline points="0,0 8,4 0,8"></polyline>
            </marker>
        </defs>
        <path d="M 32 0 L 32 32"
              marker-end="url(#arrow-1)"
              stroke-width="3"
              stroke="#000"
              fill="none"
              stroke-dasharray="8,2">
        </path>
    </svg>
    <em>pure static SVG,
        <br>
        no CSS</em>
</div>
<div>
    <strong>SMIL Animation</strong>
    <svg width="64" height="64">
        <defs>
            <marker id="arrow-2"
                    orient="auto"
                    viewBox="0 0 8 8"
                    markerWidth="8"
                    markerHeight="8"
                    markerUnits="strokeWidth"
                    refX="0"
                    refY="4"
                    fill="#000">
                <polyline points="0,0 8,4 0,8">
                    <animate dur="3s"
                             repeatCount="indefinite"
                             attributeName="fill-opacity"
                             values="0;1;0">
                    </animate>
                </polyline>
            </marker>
        </defs>
        <path d="M 32 0 L 32 32"
              marker-end="url(#arrow-2)"
              stroke-width="3"
              stroke="#000"
              fill="none"
              stroke-dasharray="8,2">
            <animate dur="3s" repeatCount="indefinite" attributeName="stroke-opacity" values="0;1;0"></animate>
            <animate dur="3s" repeatCount="indefinite" attributeName="stroke-dashoffset" values="0;-80;-160"></animate>
            <animate dur="3s" repeatCount="indefinite" attributeName="d"
                     values="M 32 0 L 32 0; M 32 0 L 32 32; M 32 0 L 32 32; M 32 32 L 32 32;"></animate>
        </path>
    </svg>
    <em>SMIL is <a href="https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/5o0yiO440LM/59rZqirUQNwJ">deprecated</a>,
        <br>
        no CSS</em>
</div>
<div>
    <strong>CSS Animation</strong>
    <style>
        #svg-3 polyline {
            animation-name: svg-arrow;
            animation-duration: 3s;
            animation-timing-function: linear;
            animation-iteration-count: infinite;
            transform: translate(44px, 32px) rotate(90deg);
            fill: #000;
        }

#svg-3 path {
            animation-name: svg-path;
            animation-duration: 3s;
            animation-timing-function: linear;
            animation-iteration-count: infinite;
            stroke-dasharray: 8, 2;
            fill: none;
            stroke: #000;
            stroke-width: 3;
        }

@keyframes svg-arrow {
            0% {
                fill: #fff;
                transform: translate(44px, 0px) rotate(90deg);
            }

33% {
                transform: translate(44px, 32px) rotate(90deg);
            }

50% {
                fill: #000;
            }

66% {
            }

100% {
                fill: #fff;
            }
        }

@keyframes svg-path {
            0% {
                stroke: #fff;
                stroke-dashoffset: 0;
                transform: translateY(-32px);
            }

33% {
                transform: translateY(0px);
            }

50% {
                stroke: #000;
                stroke-dashoffset: -80;
            }

66% {
                transform: translateY(0px);
                stroke-dasharray: 8, 2;
            }

100% {
                stroke: #fff;
                stroke-dashoffset: -160;
                transform: translateY(32px);
            }
        }
    </style>
    <svg id="svg-3" width="64" height="64">
        <defs>
            <clipPath id="clip-arrow">
                <rect x="0" y="0" width="64" height="32"></rect>
            </clipPath>
        </defs>
        <g clip-path="url(#clip-arrow)">
            <path d="M 32 0 L 32 32"></path>
        </g>
        <polyline points="0,0 24,12 0,24"></polyline>
    </svg>
    <em>marker arrow replaced,
        <br>
        added clipPath</em>
</div>
</body>