HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isTrusted guard</title>
</head>
<body>
  <button id="btn" type="button">Main button (click me)</button>
  <button id="fake" type="button">Fire untrusted clicks</button>
  <pre id="out">Waiting...</pre>
  <script>
    var btn = document.getElementById("btn");
    var out = document.getElementById("out");

    btn.addEventListener("click", function (event) {
      if (!event.isTrusted) {
        out.textContent = "Ignored untrusted click";
        return;
      }
      out.textContent = "Handled trusted click";
    });

    document.getElementById("fake").onclick = function () {
      btn.click();
      btn.dispatchEvent(new Event("click", { bubbles: true }));
    };
  </script>
</body>
</html>

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Event.isTrusted — trusted-only guard (Try It)