HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>wrapInner DOM clone demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    .shell { border: 2px dashed #94a3b8; padding: 6px; border-radius: 4px; }
    .item { background: #fef08a; margin: 8px 0; padding: 10px; border-radius: 6px; }
    #template { opacity: 0.5; margin-bottom: 12px; }
    button { margin-top: 12px; padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <div id="template"><div class="shell">Template shell (stays)</div></div>
  <div class="item">Item one content</div>
  <div class="item">Item two content</div>
  <button type="button">wrapInner with clone</button>
  <p id="hint">$(".item").wrapInner($(".shell").first())</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("button").on("click", function() {
      $(".item").wrapInner($("#template .shell").first());
      $("#hint").text("Template unchanged; cloned shell wraps each item's contents.");
    });
  </script>
</body>
</html>

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jQuery .wrapInner() — DOM element clone (Try It)