Get that svg as png

svg_png.js

var png = {
  selector: "#aaaa",
  w: "500px", h: "500px",
  fn: "fallback.png"
};

function svg2png({ selector, w, h, fn }) {
  var svg = document.querySelector( selector );
  var svgData = new XMLSerializer().serializeToString( svg );

  var canvas = document.createElement( "canvas" );
  var ctx = canvas.getContext( "2d" );
  canvas.setAttribute('width', w);
  canvas.setAttribute('height', h);

  var img = document.createElement( "img" );
  img.setAttribute( "src", "data:image/svg+xml;base64," + btoa( svgData ) );

  img.onload = function() { ctx.drawImage( img, 0, 0 );
     var a = document.createElement("a");
    a.download = fn;
    a.href = canvas.toDataURL("image/png");
    a.click();
  };
}

svg2png(png);