HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getElementsByTagNameNS svg</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <svg width="220" height="120" xmlns="http://www.w3.org/2000/svg">
    <circle cx="50" cy="60" r="40" fill="#4db6ac"></circle>
    <circle cx="150" cy="60" r="30" fill="#7986cb"></circle>
  </svg>
  <button id="btn" type="button">Find SVG circles</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 circles = document.getElementsByTagNameNS(SVG_NS, "circle");
      document.getElementById("out").textContent =
        "length: " + circles.length + "\n" +
        "first r: " + (circles[0] && circles[0].getAttribute("r"));
    });
  </script>
</body>
</html>

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Document.getElementsByTagNameNS — SVG circles (Try It)