HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>userActivation — sticky</title>
</head>
<body>
  <button id="go" type="button">Engage once</button>
  <button id="check" type="button">Check sticky</button>
  <pre id="out">Click Engage once, then Check sticky.</pre>
  <script>
    var out = document.getElementById("out");
    document.getElementById("go").addEventListener("click", function () {
      out.textContent = "Gesture recorded. Now click Check sticky.";
    });
    document.getElementById("check").addEventListener("click", function () {
      if (!("userActivation" in navigator)) {
        out.textContent = "API missing.";
        return;
      }
      if (navigator.userActivation.hasBeenActive) {
        out.textContent =
          "Sticky activation OK — proceed with an animation.";
      } else {
        out.textContent =
          "Waiting for the first user gesture on this page.";
      }
    });
  </script>
</body>
</html>

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userActivation — sticky gate (Try It)