HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>scroll helper</title>
  <style>body { min-height: 200vh; }</style>
</head>
<body>
  <button type="button" id="top">Scroll to top</button>
  <pre id="out"></pre>
  <script>
    function scrollToTop() {
      var el = document.scrollingElement;
      if (el) {
        el.scrollTop = 0;
        el.scrollLeft = 0;
      }
    }
    document.getElementById("top").addEventListener("click", function () {
      scrollToTop();
      document.getElementById("out").textContent = "Scrolled to top";
    });
  </script>
</body>
</html>

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scrollingElement — safe scroll helper (Try It)