HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>migration</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #legacy, #modern { padding: 10px 16px; margin-right: 8px; border: none; border-radius: 6px; cursor: pointer; color: #fff; user-select: none; }
    #legacy { background: #f59e0b; }
    #modern { background: #059669; }
    #out { margin-top: 12px; color: #334155; font-weight: bold; max-width: 420px; line-height: 1.5; }
  </style>
</head>
<body>
  <button type="button" id="legacy">Legacy .mousedown()</button>
  <button type="button" id="modern">Modern .on("mousedown")</button>
  <div id="out">Press either button.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#legacy").mousedown(function() {
      $("#out").text("Legacy: .mousedown(function(){ ... }) — deprecated since jQuery 3.3.");
    });
    $("#modern").on("mousedown", function() {
      $("#out").text("Modern: .on('mousedown', function(){ ... }) — use this for new code.");
    });
  </script>
</body>
</html>

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jQuery .mousedown() — migration vs .on() (Try It)