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diff --git a/testing/web-platform/tests/credential-management/fedcm-multi-idp/get-before-onload-and-during-dom-content-loaded.https.html b/testing/web-platform/tests/credential-management/fedcm-multi-idp/get-before-onload-and-during-dom-content-loaded.https.html
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index 0000000000..edc293daff
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+++ b/testing/web-platform/tests/credential-management/fedcm-multi-idp/get-before-onload-and-during-dom-content-loaded.https.html
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+<!DOCTYPE html>
+<title>Federated Credential Management API multi IDP get before onload and during DOMContentLoaded test.</title>
+<link rel="help" href="https://fedidcg.github.io/FedCM">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+
+<script type="module">
+import {set_fedcm_cookie, set_alt_fedcm_cookie, default_request_options, default_alt_request_options} from '../support/fedcm-helper.sub.js';
+
+let cookies_promise = Promise.all([set_fedcm_cookie(), set_alt_fedcm_cookie()]);
+
+promise_test(async t => {
+  let has_dom_content_loaded = false;
+  const dom_content_loaded = new Promise(resolve => {
+      document.addEventListener('DOMContentLoaded', async () => {
+          const second_cred = navigator.credentials.get(default_alt_request_options());
+          await promise_rejects_dom(t, 'NetworkError', second_cred);
+          has_dom_content_loaded = true;
+          resolve();
+      });
+  });
+  assert_false(has_dom_content_loaded);
+  const first_cred = navigator.credentials.get(default_request_options());
+  await Promise.all([cookies_promise, dom_content_loaded]);
+  assert_true(has_dom_content_loaded);
+  const first = await first_cred;
+  assert_equals(first.token, "token");
+}, "A `get` call before onload and a `get` call during DOMContentLoaded event should combine despite being called from different tasks.");
+
+</script>