HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getElementsByClassName filter</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} .test{margin:0.25rem 0;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <div class="test">DIV test</div>
  <p class="test">P test</p>
  <span class="test">SPAN test</span>
  <div class="test">Another DIV</div>
  <button id="btn" type="button">Filter to DIV only</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var testElements = document.getElementsByClassName("test");
      var testDivs = Array.prototype.filter.call(
        testElements,
        function (el) { return el.nodeName === "DIV"; }
      );
      var lines = ["matching .test: " + testElements.length, "DIV only: " + testDivs.length, ""];
      testDivs.forEach(function (el) {
        lines.push(el.textContent);
      });
      document.getElementById("out").textContent = lines.join("\n");
    });
  </script>
</body>
</html>

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Document.getElementsByClassName — Array filter (Try It)