chromium/third_party/blink/web_tests/external/wpt/fedcm/support/fedcm/disconnect-iframe.html

<!doctype html>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script type="module">
  import {disconnect_options,
          request_options_with_mediation_required,
          set_fedcm_cookie, manifest_origin} from './../fedcm-helper.sub.js';

// Loading this iframe in the test will make a FedCM call on load, and
// trigger a postMessage upon completion.
//
// message {
//   string result: "Pass" | "Failed get" | "Failed disconnect"
//   string errorType: error.name
// }
async function attemptDisconnect() {
  try {
    await IdentityCredential.disconnect(disconnect_options("1234"));
    window.top.postMessage({result: "Pass"}, "*");
  } catch (error) {
    window.top.postMessage({result: "Failed disconnect", errorType: error.name},
        "*");
  }
}

window.onload = async () => {
  window.test_driver.set_test_context(window.top);
  const params = new URLSearchParams(document.location.search);
  if (params.has("skip_get")) {
    attemptDisconnect();
    return;
  }

  // Use this variable to stop trying to select an account once the get()
  // promise is resolved.
  let cancelHelper = false;
  try {
    const credentialPromise = navigator.credentials.get(request_options_with_mediation_required());
    async function helper() {
      try {
        if (cancelHelper)
          return;

        await window.test_driver.select_fedcm_account(0);
      } catch (ex) {
        setTimeout(helper, 100);
      }
    }
    helper();
    const cred = await credentialPromise;
    await set_fedcm_cookie(manifest_origin);
    // Now that we have a get(), attempt to disconnect permission.
    attemptDisconnect();
  } catch (error) {
    window.top.postMessage({result: "Failed get", errorType: error.name}, '*');
  }
  // In case the get() call fails and no accounts may be selected, force the
  // helper function to stop calling itself.
  cancelHelper = true;
};
</script>