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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>unregisterProtocolHandler — safe</title>
  <style>
    body { font-family: system-ui, sans-serif; margin: 1.5rem; }
    button { padding: 0.5rem 1rem; cursor: pointer; }
    #out { margin-top: 1rem; white-space: pre-wrap; }
  </style>
</head>
<body>
  <p><button type="button" id="go">Unregister web+demo</button></p>
  <pre id="out">Ready.</pre>
  <script>
    function unregisterHandlerSafe(scheme, url) {
      if (typeof navigator.unregisterProtocolHandler !== "function") {
        return { ok: false, reason: "missing-api" };
      }
      if (!window.isSecureContext) {
        return { ok: false, reason: "insecure-context" };
      }
      if (!url.includes("%s")) {
        return { ok: false, reason: "missing-%s" };
      }
      try {
        navigator.unregisterProtocolHandler(scheme, url);
        return { ok: true, reason: "unregistered-requested" };
      } catch (err) {
        return { ok: false, reason: err.name };
      }
    }

    document.getElementById("go").addEventListener("click", function () {
      var handler = location.origin + "/handler?url=%s";
      document.getElementById("out").textContent = JSON.stringify(
        unregisterHandlerSafe("web+demo", handler)
      );
    });
  </script>
</body>
</html>

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unregisterProtocolHandler — safe helper (Try It)