HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>toggle title</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 480px; }
    input { padding: 8px 10px; margin-right: 8px; border: 2px solid #2563eb; border-radius: 6px; }
    button { padding: 8px 14px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #log { margin-top: 12px; color: #4338ca; font-weight: 600; }
    #hint { color: #64748b; font-size: 14px; margin-top: 8px; }
  </style>
</head>
<body>
  <button type="button" id="toggle">Change title</button>
  <input type="text" title="Hover me for tooltip">
  <div id="log"></div>
  <p id="hint">Hover the input when title is set — official removeAttr demo.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var inputTitle = $("input").attr("title");
    $("#toggle").on("click", function() {
      var input = $(this).next("input");
      if (input.attr("title") === inputTitle) {
        input.removeAttr("title");
      } else {
        input.attr("title", inputTitle);
      }
      $("#log").html("input title is now " + input.attr("title"));
    });
  </script>
</body>
</html>

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jQuery .removeAttr() — toggle title (Try It)