HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hover migration</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #legacy, #modern { padding: 14px 20px; margin: 8px 0; border-radius: 6px; cursor: default; color: #fff; display: inline-block; }
    #legacy { background: #b45309; }
    #modern { background: #059669; }
    #out { margin-top: 12px; color: #334155; font-weight: bold; }
  </style>
</head>
<body>
  <div id="legacy">Legacy — .hover(fnIn, fnOut)</div>
  <div id="modern">Modern — .on("mouseenter") / .on("mouseleave")</div>
  <div id="out">Hover either box above.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#legacy").hover(
      function() {
        $("#out").text("Legacy: .hover(fnIn, fnOut) — deprecated since jQuery 3.3.");
      },
      function() {
        $("#out").text("Legacy: pointer left #legacy.");
      }
    );
    $("#modern").on("mouseenter", function() {
      $("#out").text("Modern: .on('mouseenter') — use this for new code.");
    }).on("mouseleave", function() {
      $("#out").text("Modern: .on('mouseleave') — pointer left #modern.");
    });
  </script>
</body>
</html>

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jQuery .hover() vs .on('mouseenter') — migration (Try It)