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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.contents() vs .children()</title>
</head>
<body>
  <div id="mixed">Before <span>middle</span> after<p>block</p> end</div>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var $box = $("#mixed");
    document.getElementById("out").textContent =
      "contents: " + $box.contents().length + "\n" +
      "children: " + $box.children().length;
  </script>
</body>
</html>

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jQuery .contents() vs .children() (Try It)