HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>replaceWith unwrap</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 520px; }

    .container { background: #fef3c7; padding: 10px; border-radius: 6px; margin-bottom: 10px; }

    .inner { color: #911; background: #fff; padding: 6px; margin: 4px 0; border-radius: 4px; }

    button { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }

    #log { margin-top: 10px; color: #64748b; font-size: 14px; }

  </style>

</head>

<body>

  <div class="container">

    <div class="inner">Scooby</div>

    <div class="inner">Dooby</div>

    <div class="inner">Doo</div>

  </div>

  <button type="button">Replace!</button>

  <p id="log">Click to unwrap the container.</p>

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

  <script>

    $("button").on("click", function() {

      var $removed = $("div.container").replaceWith(function() {

        return $(this).contents();

      });

      $("#log").text("Removed class: " + $removed.attr("class"));

    });

  </script>

</body>

</html>

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jQuery .replaceWith() — unwrap container (Try It)