HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getElementsByTagName wildcard</title>
</head>
<body>
  <div id="widget">
    <h2>Title</h2>
    <p>Text <span>nested</span></p>
    <ul><li>One</li><li>Two</li></ul>
  </div>
  <pre id="out"></pre>
  <script>
    var all = document.getElementById("widget").getElementsByTagName("*");
    document.getElementById("out").textContent = all.length + " descendant elements";
  </script>
</body>
</html>

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Element.getElementsByTagName — wildcard (Try It)