HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getElementsByTagNameNS star</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <p>HTML paragraph (not SVG)</p>
  <svg width="180" height="100" xmlns="http://www.w3.org/2000/svg">
    <circle cx="50" cy="50" r="35" fill="#81c784"></circle>
    <circle cx="120" cy="50" r="25" fill="#64b5f6"></circle>
  </svg>
  <button id="btn" type="button">List all SVG elements (*)</button>
  <pre id="out">Click the button</pre>
  <script>
    var SVG_NS = "http://www.w3.org/2000/svg";
    document.getElementById("btn").addEventListener("click", function () {
      var svgNodes = document.getElementsByTagNameNS(SVG_NS, "*");
      var names = [];
      for (var i = 0; i < svgNodes.length; i++) {
        names.push(svgNodes[i].localName);
      }
      document.getElementById("out").textContent =
        "length: " + svgNodes.length + "\n" + names.join("\n");
    });
  </script>
</body>
</html>

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