HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>html callback demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    .demo-container { border: 2px solid #6366f1; padding: 12px; border-radius: 8px; background: #eef2ff; min-height: 40px; }
    p { margin: 6px 0; }
    button { margin-top: 12px; padding: 10px 16px; background: #059669; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    em { color: #dc2626; font-style: normal; font-weight: bold; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <p>Paragraph one</p>
  <p>Paragraph two</p>
  <p>Paragraph three</p>
  <div class="demo-container">Old container content</div>
  <button type="button">Set html with callback</button>
  <p id="hint">Callback builds HTML using $("p").length.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("button").on("click", function() {
      $(".demo-container").html(function() {
        var emphasis = "<em>" + $("p").not("#hint").length + " paragraphs!</em>";
        return "<p>All new content for " + emphasis + "</p>";
      });
      $("#hint").text("Container replaced via .html(callback).");
    });
  </script>
</body>
</html>

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jQuery .html(callback) — dynamic content (Try It)