HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>blur() — event</title>
</head>
<body>
  <pre id="out">Switch tabs to see blur/focus events.</pre>
  <script>
    var out = document.getElementById("out");
    function log(msg) {
      out.textContent += "\n" + msg;
    }
    window.addEventListener("blur", function () {
      log("Tab lost focus");
    });
    window.addEventListener("focus", function () {
      log("Tab is active again");
    });
  </script>
</body>
</html>

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JavaScript Window blur() — blur event (Try It)