HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>prop vs attr checked</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 540px; }
    p { margin-top: 12px; font-family: ui-monospace, monospace; font-size: 13px; line-height: 1.7; background: #eff6ff; padding: 10px; border-radius: 6px; }
    b { color: #2563eb; }
  </style>
</head>
<body>
  <label><input type="checkbox" checked> Check me — toggle and compare</label>
  <p id="out"></p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("input").on("change", function() {
      var $input = $(this);
      $("#out").html(
        '.attr("checked"): <b>' + $input.attr("checked") + '</b><br>' +
        '.prop("checked"): <b>' + $input.prop("checked") + '</b><br>' +
        '.is(":checked"): <b>' + $input.is(":checked") + '</b>'
      );
    }).trigger("change");
  </script>
</body>
</html>

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jQuery .prop() — checkbox attr vs prop (Try It)