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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>blur() — call</title>
</head>
<body>
  <h1>window.blur() call</h1>
  <button type="button" id="btn">Call blur()</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      window.blur();
      document.getElementById("out").textContent =
        "blur() called — expect no tab change";
    };
  </script>
</body>
</html>

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JavaScript Window blur() — call (Try It)