<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" onload="init()">

    <script>
        var d;
        function init()
        {
            var polyline = document.createElementNS("http://www.w3.org/2000/svg", "polyline");
            polyline.setAttribute("points", d);
            var g = document.getElementById("container");
            g.appendChild(polyline);
            // verify that the script arrived here without error by filling the rectangle with green
            document.getElementById("passed").setAttribute("fill", "green");
        }
    </script>
    
    <rect id="passed" x="0" y="0" width="100" height="100" fill="red"/>
    <g id="container"></g>

</svg>