HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getElementsByClassName filter</title>
</head>
<body>
  <div class="test">DIV 1</div>
  <p class="test">Paragraph</p>
  <div class="test">DIV 2</div>
  <span class="test">Span</span>
  <pre id="out"></pre>
  <script>
    var testElements = document.getElementsByClassName("test");
    var testDivs = Array.prototype.filter.call(
      testElements,
      function (el) { return el.nodeName === "DIV"; }
    );
    document.getElementById("out").textContent = testDivs.length;
  </script>
</body>
</html>

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Element.getElementsByClassName — filter DIVs (Try It)