HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createElementNS SVG</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} #mount{margin:1rem 0;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <button id="btn" type="button">Draw SVG circle</button>
  <div id="mount"></div>
  <pre id="out"></pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var svgNS = "http://www.w3.org/2000/svg";
      var svg = document.createElementNS(svgNS, "svg");
      svg.setAttribute("width", "100");
      svg.setAttribute("height", "100");
      var circle = document.createElementNS(svgNS, "circle");
      circle.setAttribute("cx", "50");
      circle.setAttribute("cy", "50");
      circle.setAttribute("r", "40");
      circle.setAttribute("fill", "steelblue");
      svg.appendChild(circle);
      var mount = document.getElementById("mount");
      mount.innerHTML = "";
      mount.appendChild(svg);
      document.getElementById("out").textContent = [
        "SVGSVGElement: " + (svg instanceof SVGSVGElement),
        "SVGCircleElement: " + (circle instanceof SVGCircleElement)
      ].join("\n");
    });
  </script>
</body>
</html>

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Document.createElementNS — SVG circle (Try It)