HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>defer analytics</title>
</head>
<body>
  <pre id="out">(waiting)</pre>
  <script>
    function initAnalytics() {
      document.getElementById("out").textContent = "Analytics initialized";
    }
    if ("prerendering" in document && document.prerendering) {
      document.addEventListener("prerenderingchange", initAnalytics, { once: true });
      document.getElementById("out").textContent = "Waiting for prerenderingchange...";
    } else {
      initAnalytics();
    }
  </script>
</body>
</html>

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Document prerenderingchange — defer analytics (Try It)