HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>filter paragraphs</title>
</head>
<body>
  <p>First paragraph</p>
  <div>Not a paragraph</div>
  <p>Second paragraph</p>
  <pre id="out">Waiting...</pre>
  <script>
    var iterator = document.createNodeIterator(
      document.body,
      NodeFilter.SHOW_ELEMENT,
      {
        acceptNode: function (node) {
          return node.nodeName.toLowerCase() === "p"
            ? NodeFilter.FILTER_ACCEPT
            : NodeFilter.FILTER_REJECT;
        }
      }
    );
    var pars = [];
    var node;
    while ((node = iterator.nextNode())) {
      pars.push(node.textContent);
    }
    document.getElementById("out").textContent = JSON.stringify(pars);
  </script>
</body>
</html>

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NodeIterator.filter — paragraphs (Try It)