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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>contains — siblings</title>

</head>

<body>

  <div id="box-a">A</div>

  <div id="box-b">B</div>

  <pre id="out"></pre>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    (function () {

      var boxA = document.getElementById("box-a");

      var boxB = document.getElementById("box-b");

      document.getElementById("out").textContent = [

        "A contains B: " + $.contains(boxA, boxB),

        "A contains A: " + $.contains(boxA, boxA)

      ].join("\n");

    })();

  </script>

</body>

</html>

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