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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>onclick prop not removeAttr</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 480px; }
    button.demo { padding: 10px 16px; margin: 6px 6px 6px 0; border-radius: 6px; cursor: pointer; border: 2px solid #6366f1; background: #eef2ff; }
    #log { margin-top: 12px; font-family: ui-monospace, monospace; font-size: 13px; background: #fef3c7; padding: 10px; border-radius: 6px; color: #92400e; }
  </style>
</head>
<body>
  <button type="button" class="demo" onclick="alert('Inline handler ran')">Has inline onclick</button>
  <button type="button" id="fix">Clear with .prop('onclick', null)</button>
  <div id="log">Click the first button, then Clear — recommended for inline handlers in IE.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#fix").on("click", function() {
      $(".demo").prop("onclick", null);
      $("#log").text("onclick property: " + $(".demo")[0].onclick + " — click first button again (no alert).");
    });
  </script>
</body>
</html>

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jQuery .removeAttr() — onclick use .prop() (Try It)