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: 12px 18px; margin-right: 8px; display: inline-block; border-radius: 6px; color: #fff; cursor: default; }
    #legacy { background: #f59e0b; }
    #modern { background: #059669; }
    #log { margin-top: 12px; color: #334155; font-weight: bold; max-width: 420px; line-height: 1.5; }
  </style>
</head>
<body>
  <div id="legacy">Legacy .mouseover()</div>
  <div id="modern">Modern .on("mouseover")</div>
  <div id="log">Enter either box.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#legacy").mouseover(function() {
      $("#log").text("Legacy: .mouseover(function(){ ... }) — deprecated since jQuery 3.3.");
    });
    $("#modern").on("mouseover", function() {
      $("#log").text("Modern: .on('mouseover', function(){ ... }) — use this for new code.");
    });
  </script>
</body>
</html>

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