HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>prepend element move</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    p { background: #fef08a; margin: 6px 0; padding: 8px 10px; border-radius: 4px; }
    b { color: #dc2626; }
    button { margin-top: 12px; padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #source { padding: 8px; border: 1px dashed #94a3b8; margin-bottom: 10px; border-radius: 6px; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <div id="source">is what was said. <b>Hello</b></div>
  <p>End of paragraph one.</p>
  <button type="button">Prepend b into paragraphs</button>
  <p id="hint">$("p").prepend($("b")) moves the bold tag to the start.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("button").on("click", function() {
      $("p").not("#hint").prepend($("b"));
      $("#source").text("is what was said. (b moved)");
      $("#hint").text("<b>Hello</b> prepended as first child of paragraph.");
    });
  </script>
</body>
</html>

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jQuery .prepend() — move b element (Try It)