HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>blur() — return</title>
</head>
<body>
  <h1>window.blur() return</h1>
  <button type="button" id="btn">Call and log</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      var result = window.blur();
      document.getElementById("out").textContent =
        String(result) + "\n" + typeof result;
    };
  </script>
</body>
</html>

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JavaScript Window blur() — return value (Try It)