diff --git a/testing/web-platform/tests/html/cross-origin-embedder-policy/anonymous-iframe/cookie-store.tentative.https.window.js b/testing/web-platform/tests/html/cross-origin-embedder-policy/anonymous-iframe/cookie-store.tentative.https.window.js
new file mode 100644
index 000000000000..2332cb4950c3
--- /dev/null
+++ b/testing/web-platform/tests/html/cross-origin-embedder-policy/anonymous-iframe/cookie-store.tentative.https.window.js
@@ -0,0 +1,92 @@
+// META: timeout=long
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+// META: script=/common/dispatcher/dispatcher.js
+// META: script=../credentialless/resources/common.js
+// META: script=./resources/common.js
+
+// A set of tests, checking cookies defined from within an anonymous iframe
+// continue to work.
+
+const same_origin = get_host_info().HTTPS_ORIGIN;
+const cross_origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const cookie_key = token()
+
+const anonymous_iframe = newAnonymousIframe(cross_origin);
+
+// Install some helper functions in the child to observe Cookies:
+promise_setup(async () => {
+  await send(anonymous_iframe, `
+    window.getMyCookie = () => {
+      const value = "; " + document.cookie;
+      const parts = value.split("; ${cookie_key}=");
+      if (parts.length !== 2)
+        return undefined
+      return parts.pop().split(';').shift();
+    };
+
+    window.nextCookieValue = () => {
+      return new Promise(resolve => {
+        const old_cookie = getMyCookie();
+        const interval = setInterval(() => {
+          const next_cookie_value = getMyCookie();
+          if (old_cookie !== next_cookie_value) {
+            clearInterval(interval);
+            resolve(next_cookie_value)
+          }
+        })
+      });
+    };
+  `);
+}, "Setup");
+
+promise_test(async test => {
+  const this_token = token();
+  send(anonymous_iframe, `
+    document.cookie = "${cookie_key}=cookie_value_1";
+    send("${this_token}", getMyCookie());
+  `);
+
+  assert_equals(await receive(this_token), "cookie_value_1");
+}, "Set/Get cookie via JS API");
+
+promise_test(async test => {
+  const resource_token = token();
+  send(anonymous_iframe, `
+    fetch("${showRequestHeaders(cross_origin, resource_token)}");
+  `);
+
+  const request_headers = JSON.parse(await receive(resource_token));
+  const cookie_value = parseCookies(request_headers)[cookie_key];
+  assert_equals(cookie_value, "cookie_value_1");
+}, "Get Cookie via subresource requests");
+
+promise_test(async test => {
+  const resource_token = token();
+  const resource_url = cross_origin + "/common/blank.html?pipe=" +
+    `|header(Set-Cookie,${cookie_key}=cookie_value_2;Path=/common/dispatcher)`;
+  const this_token = token();
+  send(anonymous_iframe, `
+    const next_cookie_value = nextCookieValue();
+    fetch("${resource_url}");
+    send("${this_token}", await next_cookie_value);
+  `);
+
+  assert_equals(await receive(this_token), "cookie_value_2");
+}, "Set Cookie via subresource requests");
+
+promise_test(async test => {
+  const resource_token = token();
+  const resource_url = cross_origin + "/common/blank.html?pipe=" +
+    `|header(Set-Cookie,${cookie_key}=cookie_value_3;Path=/common/dispatcher)`;
+  const this_token = token();
+  send(anonymous_iframe, `
+    const next_cookie_value = nextCookieValue();
+    const iframe = document.createElement("iframe");
+    iframe.src = "${resource_url}";
+    document.body.appendChild(iframe);
+    send("${this_token}", await next_cookie_value);
+  `);
+
+  assert_equals(await receive(this_token), "cookie_value_3");
+}, "Set Cookie via navigation requests");