HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>appendTo official demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    #foo { background: #fef08a; padding: 12px; border-radius: 8px; min-height: 50px; border: 2px solid #eab308; }
    span { background: #dbeafe; padding: 4px 8px; margin: 2px; border-radius: 4px; display: inline-block; }
    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>
  <p>I have nothing more to say... <span>Alpha</span> <span>Beta</span></p>
  <div id="foo">FOO!</div>
  <button type="button">Append spans to #foo</button>
  <p id="hint">Official demo: $("span").appendTo("#foo")</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("button").on("click", function() {
      $("span").appendTo("#foo");
      $("#hint").text("All spans moved into #foo as last children.");
    });
  </script>
</body>
</html>

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jQuery .appendTo() — official spans demo (Try It)