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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>permissions — change</title>
</head>
<body>
  <p>Change this site&rsquo;s location permission in browser settings to see updates.</p>
  <pre id="out">Starting…</pre>
  <script>
    var out = document.getElementById("out");
    function log(line) {
      out.textContent += line + "\n";
    }
    async function watchGeoPermission() {
      out.textContent = "";
      if (!navigator.permissions) {
        log("Permissions API missing");
        return;
      }
      var status = await navigator.permissions.query({ name: "geolocation" });
      log("initial: " + status.state);
      status.addEventListener("change", function () {
        log("changed: " + status.state);
      });
    }
    watchGeoPermission().catch(function (err) {
      log("query failed: " + (err && err.message ? err.message : err));
    });
  </script>
</body>
</html>

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permissions — change listener (Try It)