HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>returnValue set</title>
</head>
<body>
  <a id="link" href="https://example.com" target="_blank" rel="noopener">Example link</a>
  <pre id="out">Waiting...</pre>
  <script>
    var out = document.getElementById("out");
    document.getElementById("link").addEventListener("click", function (event) {
      event.returnValue = false; // legacy — prefer preventDefault()
      out.textContent =
        "returnValue = " + event.returnValue +
        "\ndefaultPrevented = " + event.defaultPrevented;
    });
  </script>
</body>
</html>

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Event.returnValue — set false (Try It)