HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>branch on visibilityState</title>
  <style>body{font-family:system-ui,sans-serif;margin:1.5rem}</style>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var out = document.getElementById("out");
    function onVisibilityChange() {
      if (document.visibilityState === "hidden") {
        out.textContent = "Page hidden — pause timers, media, polling";
      } else {
        out.textContent = "Page visible — resume activity";
      }
    }
    document.addEventListener("visibilitychange", onVisibilityChange);
    onVisibilityChange();
  </script>
</body>
</html>

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Document.visibilityState — branch on state (Try It)