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diff --git a/testing/web-platform/tests/secure-payment-confirmation/enrollment-in-iframe.sub.https.html b/testing/web-platform/tests/secure-payment-confirmation/enrollment-in-iframe.sub.https.html
new file mode 100644
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+++ b/testing/web-platform/tests/secure-payment-confirmation/enrollment-in-iframe.sub.https.html
@@ -0,0 +1,166 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test for the 'secure-payment-confirmation' payment method enrollment - cross origin</title>
+<link rel="help" href="https://w3c.github.io/secure-payment-confirmation#client-extension-processing-registration">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="utils.sub.js"></script>
+
+<!-- This test requires a non-empty body to workaround https://github.com/web-platform-tests/wpt/issues/34563 -->
+<body><div>Non-empty body</div></body>
+
+<script>
+'use strict';
+
+promise_test(async t => {
+  // Make sure that we are testing enrolling an SPC credential in a
+  // cross-origin iframe.
+  assert_not_equals(window.location.hostname, '{{hosts[alt][]}}',
+      'This test must not be run on the alt hostname.');
+
+  const authenticator = await window.test_driver.add_virtual_authenticator(
+      AUTHENTICATOR_OPTS);
+  t.add_cleanup(() => {
+    return window.test_driver.remove_virtual_authenticator(authenticator);
+  });
+
+  const frame = document.createElement('iframe');
+  frame.allow = 'payment';
+  frame.src = 'https://{{hosts[alt][]}}:{{ports[https][0]}}' +
+      '/secure-payment-confirmation/resources/iframe-enroll.html';
+
+  // Wait for the iframe to load.
+  const readyPromise = new Promise(resolve => {
+      window.addEventListener('message', function handler(evt) {
+        if (evt.source === frame.contentWindow && evt.data.type == 'loaded') {
+          window.removeEventListener('message', handler);
+
+          resolve(evt.data);
+        }
+      });
+  });
+  document.body.appendChild(frame);
+  await readyPromise;
+
+  const resultPromise = new Promise(resolve => {
+      window.addEventListener('message', function handler(evt) {
+        if (evt.source === frame.contentWindow && evt.data.type == 'spc_result') {
+          window.removeEventListener('message', handler);
+          document.body.removeChild(frame);
+          resolve(evt.data);
+        }
+      });
+  });
+  frame.contentWindow.postMessage({ userActivation: true }, '*');
+  const result = await resultPromise;
+
+  // Because we specified the 'payment' permission and the iframe had a user
+  // activation, the enrollment should work.
+  assert_equals(result.error, null);
+  assert_own_property(result, 'id');
+  assert_own_property(result, 'rawId');
+}, 'SPC enrollment in cross-origin iframe');
+
+promise_test(async t => {
+  // Make sure that we are testing enrolling an SPC credential in a
+  // cross-origin iframe.
+  assert_not_equals(window.location.hostname, '{{hosts[alt][]}}',
+      'This test must not be run on the alt hostname.');
+
+  const authenticator = await window.test_driver.add_virtual_authenticator(
+      AUTHENTICATOR_OPTS);
+  t.add_cleanup(() => {
+    return window.test_driver.remove_virtual_authenticator(authenticator);
+  });
+
+  const frame = document.createElement('iframe');
+  frame.allow = 'payment';
+  frame.src = 'https://{{hosts[alt][]}}:{{ports[https][0]}}' +
+      '/secure-payment-confirmation/resources/iframe-enroll.html';
+
+  // Wait for the iframe to load.
+  const readyPromise = new Promise(resolve => {
+      window.addEventListener('message', function handler(evt) {
+        if (evt.source === frame.contentWindow && evt.data.type == 'loaded') {
+          window.removeEventListener('message', handler);
+
+          resolve(evt.data);
+        }
+      });
+  });
+  document.body.appendChild(frame);
+  await readyPromise;
+
+  const resultPromise = new Promise(resolve => {
+      window.addEventListener('message', function handler(evt) {
+        if (evt.source === frame.contentWindow && evt.data.type == 'spc_result') {
+          window.removeEventListener('message', handler);
+          document.body.removeChild(frame);
+          resolve(evt.data);
+        }
+      });
+  });
+  frame.contentWindow.postMessage({ userActivation: false }, '*');
+  const result = await resultPromise;
+
+  // Without a user activation, we expect a SecurityError.
+  assert_true(result.error instanceof DOMException);
+  assert_equals(result.error.name, 'SecurityError');
+  assert_not_own_property(result, 'id');
+  assert_not_own_property(result, 'rawId');
+}, 'SPC enrollment in cross-origin iframe fails without user activation');
+
+promise_test(async t => {
+  // Make sure that we are testing enrolling an SPC credential in a
+  // cross-origin iframe.
+  assert_not_equals(window.location.hostname, '{{hosts[alt][]}}',
+      'This test must not be run on the alt hostname.');
+
+  const authenticator = await window.test_driver.add_virtual_authenticator(
+      AUTHENTICATOR_OPTS);
+  t.add_cleanup(() => {
+    return window.test_driver.remove_virtual_authenticator(authenticator);
+  });
+
+  const frame = document.createElement('iframe');
+  // This iframe does *not* have a payments permission specified on it, and so
+  // should not allow SPC credential creation.
+  frame.src = 'https://{{hosts[alt][]}}:{{ports[https][0]}}' +
+      '/secure-payment-confirmation/resources/iframe-enroll.html';
+
+  // Wait for the iframe to load.
+  const readyPromise = new Promise(resolve => {
+      window.addEventListener('message', function handler(evt) {
+        if (evt.source === frame.contentWindow && evt.data.type == 'loaded') {
+          window.removeEventListener('message', handler);
+
+          resolve(evt.data);
+        }
+      });
+  });
+  document.body.appendChild(frame);
+  await readyPromise;
+
+  const resultPromise = new Promise(resolve => {
+      window.addEventListener('message', function handler(evt) {
+        if (evt.source === frame.contentWindow && evt.data.type == 'spc_result') {
+          window.removeEventListener('message', handler);
+          document.body.removeChild(frame);
+          resolve(evt.data);
+        }
+      });
+  });
+  frame.contentWindow.postMessage({ userActivation: true }, '*');
+  const result = await resultPromise;
+
+  // Because we didn't specify the 'payment' permission, the enrollment should
+  // result in an error.
+  assert_own_property(result, 'error');
+  assert_true(result.error instanceof DOMException);
+  assert_equals(result.error.name, 'NotSupportedError');
+  assert_not_own_property(result, 'id');
+  assert_not_own_property(result, 'rawId');
+}, 'SPC enrollment in cross-origin iframe without payment permission');
+</script>