$("#menu-save-image").click(function () {
    var svg = document.getElementsByTagName('svg');
    var canvas = document.getElementById("test");
    canvg(canvas, svg);

    // or second way
    var c = document.getElementById('test');
    var ctx = c.getContext('2d');
    ctx.drawSvg(svg, 0, 0, 500, 500);


});