HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery scoped all selector</title>
  <style>
    h3 { margin: 0 0 12px; }
    div, span, p {
      width: 80px;
      height: 40px;
      float: left;
      padding: 10px;
      margin: 10px;
      background-color: #EEEEEE;
    }
    #test {
      width: auto;
      height: auto;
      background-color: transparent;
    }
  </style>
</head>
<body>
  <div id="test">
    <div>DIV</div>
    <span>SPAN</span>
    <p>P</p>
    <button type="button">Button</button>
  </div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var elementCount = $("#test").find("*").css("border", "3px solid red").length;
    $("body").prepend("<h3>" + elementCount + " elements found</h3>");
  </script>
</body>
</html>

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jQuery $("#test").find("*") — scoped all selector (Try It)